mapnik/SConstruct

# This file is part of Mapnik (c++ mapping toolkit)
#
# Copyright (C) 2009 Artem Pavlenko, Jean-Francois Doyon, Dane Springmeyer
#
# Mapnik is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
#
# $Id$


import os
import sys
import re
import platform
from glob import glob
from subprocess import Popen, PIPE
from SCons.SConf import SetCacheMode
import pickle

try:
    import distutils.sysconfig
    HAS_DISTUTILS = True
except:
    HAS_DISTUTILS = False

#### SCons build options and initial setup ####
env = Environment(ENV=os.environ)

def color_print(color,text,newline=True):
    # 1 - red
    # 2 - green
    # 3 - yellow
    # 4 - blue
    text = "\033[9%sm%s\033[0m" % (color,text)
    if not newline:
        print text,
    else:
        print text

def regular_print(color,text,newline=True):
    if not newline:
        print text,
    else:
        print text

def call(cmd, silent=False):
    stdin, stderr = Popen(cmd,shell=True,stdout=PIPE,stderr=PIPE).communicate()
    if not stderr:
        return stdin.strip()
    elif not silent:
        color_print(1,'Problem encounted with SCons scripts, please post bug report to: http://trac.mapnik.org\nError was: %s' % stderr)

def shortest_name(libs):
    name = '-'*200
    for lib in libs:
        if len(name) > len(lib):
            name = lib
    return name

DEFAULT_LINK_PRIORITY = ['internal','other','frameworks','user','system']

def sort_paths(items,priority):
    """Sort paths such that compiling and linking will globally prefer custom or local libs
    over system libraries by fixing up the order libs are passed to gcc and the linker.
    
    Ideally preference could be by-target instead of global, but our SCons implementation
    is not currently utilizing different SCons build env()'s as we should.
    
    Overally the current approach within these scripts is to prepend paths of preference
    and append all others, but this does not give enough control (particularly due to the
    approach of assuming /usr/LIBSCHEMA and letting paths be parsed and added by pkg-config).
    
    In effect /usr/lib is likely to come before /usr/local/lib which makes linking against
    custom built icu or boost impossible when those libraries are available in both places.
    
    Sorting using a priority list allows this to be controlled, and fine tuned.
    """
    
    new = []
    path_types = {'internal':[],'other':[],'frameworks':[],'user':[],'system':[]}
    # parse types of paths into logical/meaningful groups
    # based on commonly encountered lib directories on linux and osx
    for i in items:
        # internal paths for code kept inside
        # the mapnik sources
        if i.startswith('#'):
            path_types['internal'].append(i)
        # Mac OS X user installed frameworks
        elif '/Library/Frameworks' in i:
            path_types['frameworks'].append(i)
        # various 'local' installs like /usr/local or /opt/local
        elif 'local' in i or '/sw' in i:
            path_types['user'].append(i)
        # key system libs (likely others will fall into 'other')
        elif '/usr/' in i or '/System' in i or '/lib' in i:
            path_types['system'].append(i)
        # anything not yet matched...
        # likely a combo of rare system lib paths and
        # very custom user paths that should ideally be
        # in 'user'
        else:
            path_types['other'].append(i)
    # build up new list based on priority list
    for path in priority:
        if path_types.has_key(path):
            dirs = path_types[path]
            new.extend(dirs)
            path_types.pop(path)
        else:
            color_print(1,'\nSorry, "%s" is NOT a valid value for option "LINK_PRIORITY": values include: %s' % (path,','.join(path_types.keys())))
            color_print(1,'\tinternal: the local directory of the Mapnik sources (prefix #) (eg. used to link internal agg)')
            color_print(1,'\tframeworks: on osx the /Library/Frameworks directory')
            color_print(1,'\tuser: any path with "local" or "/sw" inside it')
            color_print(1,'\tsystem: any path not yet matched with "/usr/","/lib", or "/System" (osx) inside it')
            color_print(1,'\tother: any paths you specified not matched by criteria used to parse the others')
            color_print(1,'\tother: any paths you specified not matched by criteria used to parse the others')
            color_print(1,'The Default priority is: %s' % ','.join(DEFAULT_LINK_PRIORITY))
            color_print(1,'Any priority groups not listed will be appended to the list at the end')
            Exit(1)
    # append remaining paths potentially not requested
    # by any custom priority list defined by user
    for k,v in path_types.items():
        new.extend(v)
    return new

if platform.dist()[0] in ('Ubuntu','debian'):
    LIBDIR_SCHEMA='lib'
elif platform.uname()[4] == 'x86_64' and platform.system() == 'Linux':
    LIBDIR_SCHEMA='lib64' 
elif platform.uname()[4] == 'ppc64':
    LIBDIR_SCHEMA='lib64'
else:
    LIBDIR_SCHEMA='lib'

pretty_dep_names = {
    'ociei':'Oracle database library | configure with OCCI_LIBS & OCCI_INCLUDES | more info: http://trac.mapnik.org/wiki/OCCI',
    'gdal':'GDAL C++ library | configured using gdal-config program | try setting GDAL_CONFIG SCons option | more info: http://trac.mapnik.org/wiki/GDAL',
    'ogr':'OGR-enabled GDAL C++ Library | configured using gdal-config program | try setting GDAL_CONFIG SCons option | more info: http://trac.mapnik.org/wiki/OGR',
    'cairo':'Cairo C library | configured using pkg-config | try setting PKG_CONFIG_PATH SCons option',
    'cairomm':'Cairomm C++ bindings to Cairo library | configured using pkg-config | try setting PKG_CONFIG_PATH SCons option',
    'pycairo':'Python bindings to Cairo library | configured using pkg-config | try setting PKG_CONFIG_PATH SCons option',
    'proj':'Proj.4 C Projections library | configure with PROJ_LIBS & PROJ_INCLUDES | more info: http://trac.osgeo.org/proj/',
    'pg':'Postgres C Library requiered for PostGIS plugin | configure with pg_config program | more info: http://trac.mapnik.org/wiki/PostGIS',
    'sqlite3':'SQLite3 C Library | configure with SQLITE_LIBS & SQLITE_INCLUDES | more info: http://trac.mapnik.org/wiki/SQLite',
    'osm':'more info: http://trac.mapnik.org/wiki/OsmPlugin',
    'jpeg':'JPEG C library | configure with JPEG_LIBS & JPEG_INCLUDES',
    'tiff':'TIFF C library | configure with TIFF_LIBS & TIFF_INCLUDES',
    'png':'PNG C library | configure with PNG_LIBS & PNG_INCLUDES',
    'icuuc':'ICU C++ library | configure with ICU_LIBS & ICU_INCLUDES or use ICU_LIB_NAME to specify custom lib name  | more info: http://site.icu-project.org/',
    'ltdl':'GNU Libtool | more info: http://www.gnu.org/software/libtool',
    'z':'Z compression library | more info: http://www.zlib.net/',
    'm':'Basic math library, part of C++ stlib',
    'pkg-config':'pkg-config tool | more info: http://pkg-config.freedesktop.org',
    'pg_config':'pg_config program | try setting PG_CONFIG SCons option',
    'xml2-config':'xml2-config program | try setting XML2_CONFIG SCons option',
    'gdal-config':'gdal-config program | try setting GDAL_CONFIG SCons option',
    'freetype-config':'freetype-config program | try setting FREETYPE_CONFIG SCons option',
    }
    
def pretty_dep(dep):
    pretty = pretty_dep_names.get(dep)
    if pretty:
        return '%s (%s)' % (dep,pretty)
    elif 'boost' in dep:
        return '%s (%s)' % (dep,'more info see: http://trac.mapnik.org/wiki/MapnikInstallation & http://www.boost.org')
    return dep

# local file to hold custom user configuration variables
SCONS_LOCAL_CONFIG = 'config.py'
# build log
SCONS_LOCAL_LOG = 'config.log'
# local pickled file to cache configured environment
SCONS_CONFIGURE_CACHE = 'config.cache'
# directory SCons uses to stash build tests
SCONF_TEMP_DIR = '.sconf_temp'
# auto-search directories for boost libs/headers
BOOST_SEARCH_PREFIXES = ['/usr/local','/opt/local','/sw','/usr',]


# Core plugin build configuration
# opts.AddVariables still hardcoded however...
PLUGINS = { # plugins with external dependencies
            'postgis': {'default':True,'path':'PGSQL','inc':'libpq-fe.h','lib':'pq','lang':'C'},
            'gdal':    {'default':False,'path':None,'inc':'gdal_priv.h','lib':'gdal','lang':'C++'},
            'ogr':     {'default':False,'path':None,'inc':'ogrsf_frmts.h','lib':'gdal','lang':'C++'},
            'occi':    {'default':False,'path':'OCCI','inc':'occi.h','lib':'ociei','lang':'C++'},
            'sqlite':  {'default':False,'path':'SQLITE','inc':'sqlite3.h','lib':'sqlite3','lang':'C'},
            
            # todo: osm plugin does depend on libxml2 and libcurl
            'osm':     {'default':False,'path':None,'inc':None,'lib':None,'lang':'C++'},

            # plugins without external dependencies requiring CheckLibWithHeader...
            'shape':   {'default':True,'path':None,'inc':None,'lib':None,'lang':'C++'},
            'raster':  {'default':True,'path':None,'inc':None,'lib':None,'lang':'C++'},
            'kismet':  {'default':False,'path':None,'inc':None,'lib':None,'lang':'C++'},
            }

DEFAULT_PLUGINS = []
for k,v in PLUGINS.items():
   if v['default']:
       DEFAULT_PLUGINS.append(k)

# All of the following options may be modified at the command-line, for example:
# `python scons/scons.py PREFIX=/opt`
opts = Variables()

opts.AddVariables(
    # Compiler options
    ('CXX', 'The C++ compiler to use (defaults to g++).', 'g++'),
    EnumVariable('OPTIMIZATION','Set g++ optimization level','2', ['0','1','2','3','4']),
    # Note: setting DEBUG=True will override any custom OPTIMIZATION level
    BoolVariable('DEBUG', 'Compile a debug version of Mapnik', 'False'),
    BoolVariable('XML_DEBUG', 'Compile a XML verbose debug version of mapnik', 'False'),
    ListVariable('INPUT_PLUGINS','Input drivers to include',DEFAULT_PLUGINS,PLUGINS.keys()),
    
    # SCons build behavior options
    ('CONFIG', "The path to the python file in which to save user configuration options. Currently : '%s'" % SCONS_LOCAL_CONFIG,SCONS_LOCAL_CONFIG),
    BoolVariable('USE_CONFIG', "Use SCons user '%s' file (will also write variables after successful configuration)", 'True'),
    BoolVariable('FAST', "Make scons faster at the cost of less precise dependency tracking", 'False'),
    BoolVariable('PRIORITIZE_LINKING', 'Sort list of lib and inc directories to ensure preferencial compiling and linking (useful when duplicate libs)', 'True'),
    ('LINK_PRIORITY','Priority list in which to sort library and include paths (default order is internal, other, frameworks, user, then system - see source of `sort_paths` function for more detail)',','.join(DEFAULT_LINK_PRIORITY)),    
    
    # Install Variables
    ('PREFIX', 'The install path "prefix"', '/usr/local'),
    ('PYTHON_PREFIX','Custom install path "prefix" for python bindings (default of no prefix)',''),
    ('DESTDIR', 'The root directory to install into. Useful mainly for binary package building', '/'),
    
    # Boost variables
    # default is '/usr/include', see FindBoost method below
    ('BOOST_INCLUDES', 'Search path for boost include files', '',False),
    # default is '/usr/' + LIBDIR_SCHEMA, see FindBoost method below
    ('BOOST_LIBS', 'Search path for boost library files', '',False),
    ('BOOST_TOOLKIT','Specify boost toolkit, e.g., gcc41.','',False),
    ('BOOST_ABI', 'Specify boost ABI, e.g., d.','',False),
    ('BOOST_VERSION','Specify boost version, e.g., 1_35.','',False),
    ('BOOST_PYTHON_LIB','Specify library name or full path to boost_python lib (e.g. "boost_python-py26" or "/usr/lib/libboost_python.dylib")',''),
    
    # Variables for required dependencies
    ('FREETYPE_CONFIG', 'The path to the freetype-config executable.', 'freetype-config'),
    ('XML2_CONFIG', 'The path to the xml2-config executable.', 'xml2-config'),
    PathVariable('ICU_INCLUDES', 'Search path for ICU include files', '/usr/include', PathVariable.PathAccept),
    PathVariable('ICU_LIBS','Search path for ICU include files','/usr/' + LIBDIR_SCHEMA, PathVariable.PathAccept),
    ('ICU_LIB_NAME', 'The library name for icu (such as icuuc, sicuuc, or icucore)', 'icuuc'),
    PathVariable('PNG_INCLUDES', 'Search path for libpng include files', '/usr/include', PathVariable.PathAccept),
    PathVariable('PNG_LIBS','Search path for libpng include files','/usr/' + LIBDIR_SCHEMA, PathVariable.PathAccept),
    PathVariable('JPEG_INCLUDES', 'Search path for libjpeg include files', '/usr/include', PathVariable.PathAccept),
    PathVariable('JPEG_LIBS', 'Search path for libjpeg library files', '/usr/' + LIBDIR_SCHEMA, PathVariable.PathAccept),
    PathVariable('TIFF_INCLUDES', 'Search path for libtiff include files', '/usr/include', PathVariable.PathAccept),
    PathVariable('TIFF_LIBS', 'Search path for libtiff library files', '/usr/' + LIBDIR_SCHEMA, PathVariable.PathAccept),
    PathVariable('PROJ_INCLUDES', 'Search path for PROJ.4 include files', '/usr/local/include', PathVariable.PathAccept),
    PathVariable('PROJ_LIBS', 'Search path for PROJ.4 library files', '/usr/local/' + LIBDIR_SCHEMA, PathVariable.PathAccept),
    ('PKG_CONFIG_PATH', 'Use this path to point pkg-config to .pc files instead of the PKG_CONFIG_PATH environment setting',''),
    
    # Variables affecting rendering back-ends
    BoolVariable('INTERNAL_LIBAGG', 'Use provided libagg', 'True'),
    
    # Variables for optional dependencies
    # Note: cairo, cairomm, and pycairo all optional but configured automatically through pkg-config
    # Therefore, we use a single boolean for whether to attempt to build cairo support.
    BoolVariable('CAIRO', 'Attempt to build with Cairo rendering support', 'True'),
    ('GDAL_CONFIG', 'The path to the gdal-config executable for finding gdal and ogr details.', 'gdal-config'),
    ('PG_CONFIG', 'The path to the pg_config executable.', 'pg_config'),
    PathVariable('OCCI_INCLUDES', 'Search path for OCCI include files', '/usr/lib/oracle/10.2.0.3/client/include', PathVariable.PathAccept),
    PathVariable('OCCI_LIBS', 'Search path for OCCI library files', '/usr/lib/oracle/10.2.0.3/client/'+ LIBDIR_SCHEMA, PathVariable.PathAccept),
    PathVariable('SQLITE_INCLUDES', 'Search path for SQLITE include files', '/usr/include/', PathVariable.PathAccept),
    PathVariable('SQLITE_LIBS', 'Search path for SQLITE library files', '/usr/' + LIBDIR_SCHEMA, PathVariable.PathAccept),
    
    # Other variables
    BoolVariable('SHAPE_MEMORY_MAPPED_FILE', 'Utilize memory-mapped files in Shapefile Plugin (higher memory usage, better performance)', 'True'),
    ('SYSTEM_FONTS','Provide location for python bindings to register fonts (if given aborts installation of bundled DejaVu fonts)',''),
    ('LIB_DIR_NAME','Name to use for the "lib" folder where fonts and plugins are installed','/mapnik/'),
    PathVariable('PYTHON','Full path to Python executable used to build bindings', sys.executable),
    BoolVariable('FRAMEWORK_PYTHON', 'Link against Framework Python on Mac OS X', 'True'),
    ('FRAMEWORK_SEARCH_PATH','Custom framework search path on Mac OS X', ''),
    BoolVariable('FULL_LIB_PATH', 'Use the full path for the libmapnik.dylib "install_name" when linking on Mac OS X', 'True'),
    ListVariable('BINDINGS','Language bindings to build','all',['python']),
    EnumVariable('THREADING','Set threading support','multi', ['multi','single']),
    EnumVariable('XMLPARSER','Set xml parser ','libxml2', ['tinyxml','spirit','libxml2']),
    ('JOBS', 'Set the number of parallel compilations', "1", lambda key, value, env: int(value), int),
    BoolVariable('DEMO', 'Compile demo c++ application', 'False'),
    BoolVariable('PGSQL2SQLITE', 'Compile and install a utility to convert postgres tables to sqlite', 'False'),
    BoolVariable('COLOR_PRINT', 'Print build status information in color', 'True'),
    )
    
# variables to pickle after successful configure step
# these include all scons core variables as well as custom
# env variables needed in Sconscript files
pickle_store = [# Scons internal variables
        'CC',
        'CXX',
        'CCFLAGS',
        'CPPDEFINES',
        'CPPFLAGS',
        'CPPPATH',
        'CXXFLAGS',
        'LIBPATH',
        'LIBS',
        'LINKFLAGS',
        # Mapnik's SConstruct build variables
        'PLUGINS',
        'ABI_VERSION',
        'PLATFORM',
        'BOOST_ABI',
        'BOOST_APPEND',
        'LIBDIR_SCHEMA',
        'REQUESTED_PLUGINS',
        'SUNCC',
        'PYTHON_VERSION',
        'PYTHON_INCLUDES',
        'PYTHON_INSTALL_LOCATION',
        'PYTHON_SYS_PREFIX',
        'COLOR_PRINT',
        'HAS_BOOST_SYSTEM',
        'SVN_REVISION'
        ]

# Add all other user configurable options to pickle pickle_store
# We add here more options than are needed for the build stage
# but helpful so that scons -h shows the exact cached options
for opt in opts.options:
    if opt.key not in pickle_store:
        pickle_store.append(opt.key)

# Method of adding configure behavior to Scons adapted from:
# http://freeorion.svn.sourceforge.net/svnroot/freeorion/trunk/FreeOrion/SConstruct
preconfigured = False
force_configure = False
command_line_args = sys.argv[1:]

HELP_REQUESTED = False

if ('-h' in command_line_args) or ('--help' in command_line_args):
    HELP_REQUESTED = True
    

if 'configure' in command_line_args:
    force_configure = True
elif HELP_REQUESTED:
    preconfigured = True # this is just to ensure config gets skipped when help is requested

# initially populate environment with defaults and any possible custom arguments
opts.Update(env)

if env.has_key('COLOR_PRINT') and env['COLOR_PRINT'] == False:
    color_print = regular_print

if sys.platform == "win32":
    color_print = regular_print

color_print(4,'\nWelcome to Mapnik...\n')

# if we are not configuring overwrite environment with pickled settings
if not force_configure:
    if os.path.exists(SCONS_CONFIGURE_CACHE):
        try:
            pickled_environment = open(SCONS_CONFIGURE_CACHE, 'r')
            pickled_values = pickle.load(pickled_environment)
            for key, value in pickled_values.items():
                env[key] = value
            preconfigured = True
        except:
            # unpickling failed, so reconfigure as fallback
            preconfigured = False
    else:
        preconfigured = False

# check for missing keys in pickled settings
# which can occur when keys are added or changed between
# rebuilds, e.g. for folks following trunk
for opt in pickle_store:
    if not opt in env:
        preconfigured = False

# if custom arguments are supplied make sure to accept them
if opts.args:
    # since we have custom arguments update environment with all opts to 
    # make sure to absorb the custom ones
    opts.Update(env)
    # now since we've got custom arguments we'll disregard any 
    # pickled environment and force another configuration
    preconfigured = False

elif preconfigured:
    if not HELP_REQUESTED:
        color_print(4,'Using previous successful configuration...')
        color_print(4,'Re-configure by running "python scons/scons.py configure".')




#### Custom Configure Checks ###

def prioritize_paths(context):    
    env = context.env
    prefs = env['LINK_PRIORITY'].split(',')
    context.Message( 'Sorting lib and inc compiler paths by priority... %s' % ','.join(prefs) )
    env['LIBPATH'] = sort_paths(env['LIBPATH'],prefs)
    env['CPPPATH'] = sort_paths(env['CPPPATH'],prefs)
    ret = context.Result( True )
    return ret

def CheckPKGConfig(context, version):
    context.Message( 'Checking for pkg-config... ' )
    ret = context.TryAction('pkg-config --atleast-pkgconfig-version=%s' % version)[0]
    context.Result( ret )
    return ret

def CheckPKG(context, name):
    context.Message( 'Checking for %s... ' % name )
    ret = context.TryAction('pkg-config --exists \'%s\'' % name)[0]
    context.Result( ret )
    return ret

def parse_config(context, config, checks='--libs --cflags'):
    env = context.env
    tool = config.lower().replace('_','-')
    toolname = tool
    if config == 'GDAL_CONFIG':
        toolname += ' %s' % checks
    context.Message( 'Checking for %s... ' % toolname)
    cmd = '%s %s' % (env[config],checks)
    ret = context.TryAction(cmd)[0]
    parsed = False
    if ret:
        try:
            env.ParseConfig(cmd)
            parsed = True
        except OSError, e:
            ret = False
            print ' (xml2-config not found!)'
    if not parsed:
        if config == 'GDAL_CONFIG':
            env['SKIPPED_DEPS'].append(tool)
            conf.rollback_option('GDAL_CONFIG')
        else:
            env['MISSING_DEPS'].append(tool)        
    context.Result( ret )
    return ret

def get_pkg_lib(context, config, lib):
    libpattern = r'-l([^\s]*)'
    libname = None
    env = context.env
    context.Message( 'Checking for name of %s library... ' % lib)
    cmd = '%s --libs' % env[config]
    ret = context.TryAction(cmd)[0]
    parsed = False
    if ret:
        try:
            libnames = re.findall(libpattern,call(cmd,silent=True))
            if libnames:
              libname = libnames[0]
        except Exception, e:
            ret = False
            print ' unable to determine library name:'# %s' % str(e)
            return None
    context.Result( libname )
    return libname

def parse_pg_config(context, config):
    env = context.env
    tool = config.lower()
    context.Message( 'Checking for %s... ' % tool)
    ret = context.TryAction(env[config])[0]
    if ret:
        lib_path = call('%s --libdir' % env[config])
        inc_path = call('%s --includedir' % env[config])
        env.AppendUnique(CPPPATH = inc_path)
        env.AppendUnique(LIBPATH = lib_path)
        lpq = env['PLUGINS']['postgis']['lib']
        env.Append(LIBS = lpq)
    else:
        env['SKIPPED_DEPS'].append(tool)
        conf.rollback_option(config)
    context.Result( ret )
    return ret

def ogr_enabled(context):
    env = context.env
    context.Message( 'Checking if gdal is ogr enabled... ')
    ret = context.TryAction('%s --ogr-enabled' % env['GDAL_CONFIG'])[0]
    if not ret:
        env['SKIPPED_DEPS'].append('ogr')
    context.Result( ret )
    return ret

def rollback_option(context,variable):
    global opts
    env = context.env
    for item in opts.options:
        if item.key == variable:
            env[variable] = item.default

def FindBoost(context, prefixes, thread_flag):
    """Routine to auto-find boost header dir, lib dir, and library naming structure.
    
    """
    context.Message( 'Searching for boost libs and headers... ' )
    env = context.env
     
    BOOST_LIB_DIR = None
    BOOST_INCLUDE_DIR = None
    BOOST_APPEND = None
    env['BOOST_APPEND'] = str()
    
    if env['THREADING'] == 'multi':
        search_lib = 'libboost_thread'        
    else:
        search_lib = 'libboost_filesystem'
    
    prefixes.insert(0,os.path.dirname(env['BOOST_INCLUDES']))
    prefixes.insert(0,os.path.dirname(env['BOOST_LIBS']))
    for searchDir in prefixes:
        libItems = glob(os.path.join(searchDir, LIBDIR_SCHEMA, '%s*.*' % search_lib))
        if not libItems:
            libItems = glob(os.path.join(searchDir, 'lib/%s*.*' % search_lib))
        incItems = glob(os.path.join(searchDir, 'include/boost*/'))
        if len(libItems) >= 1 and len(incItems) >= 1:
            BOOST_LIB_DIR = os.path.dirname(libItems[0])
            BOOST_INCLUDE_DIR = incItems[0].rstrip('boost/')
            shortest_lib_name = shortest_name(libItems)
            match = re.search(r'%s(.*)\..*' % search_lib, shortest_lib_name)
            if hasattr(match,'groups'):
                BOOST_APPEND = match.groups()[0]
            break
    
    msg = str()
    
    if BOOST_LIB_DIR:
        msg += '\n  *libs found: %s' % BOOST_LIB_DIR
        env['BOOST_LIBS'] = BOOST_LIB_DIR
    else:
        env['BOOST_LIBS'] = '/usr/' + LIBDIR_SCHEMA
        msg += '\n  *using default boost lib dir: %s' % env['BOOST_LIBS']
           
    if BOOST_INCLUDE_DIR:
        msg += '\n  *headers found: %s' % BOOST_INCLUDE_DIR
        env['BOOST_INCLUDES'] = BOOST_INCLUDE_DIR
    else:
        env['BOOST_INCLUDES'] = '/usr/include'
        msg += '\n  *using default boost include dir: %s' % env['BOOST_INCLUDES']    
               
    if not env['BOOST_TOOLKIT'] and not env['BOOST_ABI'] and not env['BOOST_VERSION']:
        if BOOST_APPEND:
            msg += '\n  *lib naming extension found: %s' % BOOST_APPEND
            env['BOOST_APPEND'] = BOOST_APPEND
        else:
            msg += '\n  *no lib naming extension found'
    else:
        # Creating BOOST_APPEND according to the Boost library naming order,
        # which goes <toolset>-<threading>-<abi>-<version>. See:
        #  http://www.boost.org/doc/libs/1_35_0/more/getting_started/unix-variants.html#library-naming
        append_params = ['']
        if env['BOOST_TOOLKIT']: append_params.append(env['BOOST_TOOLKIT'])
        if thread_flag: append_params.append(thread_flag)
        if env['BOOST_ABI']: append_params.append(env['BOOST_ABI'])
        if env['BOOST_VERSION']: append_params.append(env['BOOST_VERSION'])

        # Constructing the BOOST_APPEND setting that will be used to find the
        # Boost libraries.
        if len(append_params) > 1: 
            env['BOOST_APPEND'] = '-'.join(append_params)
        msg += '\n  *using boost lib naming: %s' % env['BOOST_APPEND']

    env.AppendUnique(CPPPATH = env['BOOST_INCLUDES'])
    env.AppendUnique(LIBPATH = env['BOOST_LIBS'])    
    if env['COLOR_PRINT']:
        msg = "\033[94m%s\033[0m" % (msg)
    ret = context.Result(msg)
    return ret

def CheckBoost(context, version, silent=False):
    # Boost versions are in format major.minor.subminor
    v_arr = version.split(".")
    version_n = 0
    if len(v_arr) > 0:
        version_n += int(v_arr[0])*100000
    if len(v_arr) > 1:
        version_n += int(v_arr[1])*100
    if len(v_arr) > 2:
        version_n += int(v_arr[2])
        
    if not silent:
        context.Message('Checking for Boost version >= %s... ' % (version))
    ret = context.TryRun("""

#include <boost/version.hpp>

int main() 
{
    return BOOST_VERSION >= %d ? 0 : 1;
}

""" % version_n, '.cpp')[0]
    if silent:
        context.did_show_result=1
    context.Result(ret)
    return ret

def GetBoostLibVersion(context):
    ret = context.TryRun("""

#include <boost/version.hpp>
#include <iostream>

int main() 
{

std::cout << BOOST_LIB_VERSION << std::endl;
return 0;
}

""", '.cpp')
    # hack to avoid printed output
    context.did_show_result=1
    context.Result(ret[0])
    return ret[1].strip()

def GetMapnikLibVersion(context):
    ret = context.TryRun("""

#include <mapnik/version.hpp>
#include <iostream>

int main() 
{
    std::cout << MAPNIK_VERSION << std::endl;
    return 0;
}

""", '.cpp')
    # hack to avoid printed output
    context.did_show_result=1
    context.Result(ret[0])
    if not ret[1]:
        return []
    version = int(ret[1].strip())    
    patch_level = version % 100
    minor_version = version / 100 % 1000
    major_version = version / 100000
    return [major_version,minor_version,patch_level]

conf_tests = { 'prioritize_paths' : prioritize_paths,
               'CheckPKGConfig' : CheckPKGConfig,
               'CheckPKG' : CheckPKG,
               'FindBoost' : FindBoost,
               'CheckBoost' : CheckBoost,
               'GetBoostLibVersion' : GetBoostLibVersion,
               'GetMapnikLibVersion' : GetMapnikLibVersion,
               'parse_config' : parse_config,
               'parse_pg_config' : parse_pg_config,
               'ogr_enabled': ogr_enabled,
               'get_pkg_lib': get_pkg_lib,
               'rollback_option': rollback_option
               }


if not preconfigured:

    color_print(4,'Configuring build environment...')

    if not env['FAST']:
        SetCacheMode('force')
    
    if env['USE_CONFIG']:
        if not env['CONFIG'].endswith('.py'):
            color_print(1,'SCons CONFIG file specified is not a python file, will not be read...')
        else:
            # Accept more than one file as comma-delimited list
            user_confs = env['CONFIG'].split(',')
            # If they exist add the files to the existing `opts`
            for conf in user_confs:
                if os.path.exists(conf):
                    opts.files.append(conf)
                    color_print(4,"SCons CONFIG found: '%s', variables will be inherited..." % conf)
                    optfile = file(conf)
                    print optfile.read().replace("\n", " ").replace("'","").replace(" = ","=")
                    optfile.close()
                    
                elif not conf == SCONS_LOCAL_CONFIG:
                    # if default missing, no worries
                    # but if the default is overridden and the file is not found, give warning
                    color_print(1,"SCons CONFIG not found: '%s'" % conf)
            # Recreate the base environment using modified `opts`
            env = Environment(ENV=os.environ,options=opts)
            env['USE_CONFIG'] = True
    else:
        color_print(4,'SCons USE_CONFIG specified as false, will not inherit variables python config file...')        

    conf = Configure(env, custom_tests = conf_tests)
    
    if env['DEBUG']:
        mode = 'debug mode'
    else:
        mode = 'release mode'

    if env['XML_DEBUG']:
        mode += ' (with XML debug on)'
        
    env['PLATFORM'] = platform.uname()[0]
    color_print(4,"Configuring on %s in *%s*..." % (env['PLATFORM'],mode))

    env['MISSING_DEPS'] = []
    env['SKIPPED_DEPS'] = []
    
    env['LIBDIR_SCHEMA'] = LIBDIR_SCHEMA
    env['PLUGINS'] = PLUGINS
        
    if env['PKG_CONFIG_PATH']:
        env['ENV']['PKG_CONFIG_PATH'] = env['PKG_CONFIG_PATH']
        # otherwise this variable == os.environ["PKG_CONFIG_PATH"]

    thread_suffix = 'mt'
    if env['PLATFORM'] == 'FreeBSD':
        thread_suffix = ''
        env.Append(LIBS = 'pthread')
    
    if env['SYSTEM_FONTS']:
        if not os.path.isdir(env['SYSTEM_FONTS']):
            color_print(1,'Warning: Directory specified for SYSTEM_FONTS does not exist!')
    #### Libraries and headers dependency checks ####
    
    # Set up for libraries and headers dependency checks
    env['CPPPATH'] = ['#include', '#']
    env['LIBPATH'] = ['#src']
    
    # Solaris & Sun Studio settings (the `SUNCC` flag will only be
    # set if the `CXX` option begins with `CC`)
    SOLARIS = env['PLATFORM'] == 'SunOS'
    env['SUNCC'] = SOLARIS and env['CXX'].startswith('CC')
    
    # For Solaris include paths (e.g., for freetype2, ltdl, etc.).
    if SOLARIS:
        blastwave_dir = '/opt/csw/%s'
        env.AppendUnique(CPPPATH = blastwave_dir % 'include')
        env.AppendUnique(LIBPATH = blastwave_dir % LIBDIR_SCHEMA)
    
    # If the Sun Studio C++ compiler (`CC`) is used instead of GCC.
    if env['SUNCC']:
        env['CC'] = 'cc'
        # To be compatible w/Boost everything needs to be compiled
        # with the `-library=stlport4` flag (which needs to come
        # before the `-o` flag).
        env['CXX'] = 'CC -library=stlport4'
        if env['THREADING'] == 'multi':
            env['CXXFLAGS'] = ['-mt']
        
    # Adding the required prerequisite library directories to the include path for
    # compiling and the library path for linking, respectively.
    for required in ('PNG', 'JPEG', 'TIFF','PROJ','ICU'):
        inc_path = env['%s_INCLUDES' % required]
        lib_path = env['%s_LIBS' % required]
        env.AppendUnique(CPPPATH = inc_path)
        env.AppendUnique(LIBPATH = lib_path)

    conf.parse_config('FREETYPE_CONFIG')

    if env['XMLPARSER'] == 'tinyxml':
        env['CPPPATH'].append('#tinyxml')
        env.Append(CXXFLAGS = '-DBOOST_PROPERTY_TREE_XML_PARSER_TINYXML -DTIXML_USE_STL')
    elif env['XMLPARSER'] == 'libxml2':
        if conf.parse_config('XML2_CONFIG'):
            env.Append(CXXFLAGS = '-DHAVE_LIBXML2')
            
    if env['CAIRO'] and conf.CheckPKGConfig('0.15.0') and conf.CheckPKG('cairomm-1.0'):
        env.ParseConfig('pkg-config --libs --cflags cairomm-1.0')
        env.Append(CXXFLAGS = '-DHAVE_CAIRO')
    else:
        env['SKIPPED_DEPS'].extend(['cairo','cairomm'])

    # allow for mac osx /usr/lib/libicucore.dylib compatibility
    # requires custom supplied headers since Apple does not include them
    # details: http://lists.apple.com/archives/xcode-users/2005/Jun/msg00633.html
    # To use system lib download and make && make install one of these:
    # http://www.opensource.apple.com/tarballs/ICU/
    # then copy the headers to a location that mapnik will find
    if 'core' in env['ICU_LIB_NAME']:
        env.Append(CXXFLAGS = '-DU_HIDE_DRAFT_API')
        env.Append(CXXFLAGS = '-DUDISABLE_RENAMING')
        if os.path.exists(env['ICU_LIB_NAME']):
            env['ICU_LIB_NAME'] = os.path.basename(env['ICU_LIB_NAME']).replace('.dylib','').replace('lib','')

    LIBSHEADERS = [
        ['m', 'math.h', True,'C'],
        ['ltdl', 'ltdl.h', True,'C'],
        ['png', 'png.h', True,'C'],
        ['tiff', 'tiff.h', True,'C'],
        ['z', 'zlib.h', True,'C'],
        ['jpeg', ['stdio.h', 'jpeglib.h'], True,'C'],
        ['proj', 'proj_api.h', True,'C'],
        [env['ICU_LIB_NAME'],'unicode/unistr.h',True,'C++'],
    ]


    # if requested, sort LIBPATH and CPPPATH before running CheckLibWithHeader tests
    if env['PRIORITIZE_LINKING']:
        conf.prioritize_paths()    
    
    for libinfo in LIBSHEADERS:
        if not conf.CheckLibWithHeader(libinfo[0], libinfo[1], libinfo[3]):
            if libinfo[2]:
                color_print(1,'Could not find required header or shared library for %s' % libinfo[0])
                env['MISSING_DEPS'].append(libinfo[0])
            else:
                color_print(4,'Could not find optional header or shared library for %s' % libinfo[0])
                env['SKIPPED_DEPS'].append(libinfo[0])            

    if env['THREADING'] == 'multi':
        thread_flag = thread_suffix
    else:
        thread_flag = ''
        
    conf.FindBoost(BOOST_SEARCH_PREFIXES,thread_flag)
    
    # boost system is used in boost 1.35 and greater
    env['HAS_BOOST_SYSTEM'] = False
    boost_lib_version_from_header = conf.GetBoostLibVersion()
    if boost_lib_version_from_header:
        boost_version_from_header = int(boost_lib_version_from_header.split('_')[1])
        if boost_version_from_header >= 35:
            env['HAS_BOOST_SYSTEM'] = True
            
    
    # The other required boost headers.
    BOOST_LIBSHEADERS = [
        ['system', 'boost/system/system_error.hpp', env['HAS_BOOST_SYSTEM']],
        ['filesystem', 'boost/filesystem/operations.hpp', True],
        ['regex', 'boost/regex.hpp', True],
        ['iostreams','boost/iostreams/device/mapped_file.hpp',True],
        ['program_options', 'boost/program_options.hpp', False]
    ]
        
    if env['THREADING'] == 'multi':
        BOOST_LIBSHEADERS.append(['thread', 'boost/thread/mutex.hpp', True])
                
    # if the user is not setting custom boost configuration
    # enforce boost version greater than or equal to 1.34
    if not conf.CheckBoost('1.34'):
        color_print (1,'Boost version 1.34 or greater is requred') 
        if not env['BOOST_VERSION']:
            env['MISSING_DEPS'].append('boost version >=1.34')
    else:
        color_print (4,'Found boost lib version... %s' % boost_lib_version_from_header )
    
    for count, libinfo in enumerate(BOOST_LIBSHEADERS):
        if not conf.CheckLibWithHeader('boost_%s%s' % (libinfo[0],env['BOOST_APPEND']), libinfo[1], 'C++'):
            if libinfo[2]:
                color_print(1,'Could not find required header or shared library for boost %s' % libinfo[0])
                env['MISSING_DEPS'].append('boost ' + libinfo[0])
            else:
                color_print(4,'Could not find optional header or shared library for boost %s' % libinfo[0])
                env['SKIPPED_DEPS'].append('boost ' + libinfo[0])
    
    env['REQUESTED_PLUGINS'] = [ driver.strip() for driver in Split(env['INPUT_PLUGINS'])]
    
    color_print(4,'Checking for requested plugins dependencies...')
    for plugin in env['REQUESTED_PLUGINS']:
        details = env['PLUGINS'][plugin]
        if plugin == 'gdal':
            if conf.parse_config('GDAL_CONFIG',checks='--libs'):
                conf.parse_config('GDAL_CONFIG',checks='--cflags')
                libname = conf.get_pkg_lib('GDAL_CONFIG','gdal')
                if libname:
                    details['lib'] = libname
        elif plugin == 'postgis':
            conf.parse_pg_config('PG_CONFIG')
        elif plugin == 'ogr':
            if conf.ogr_enabled():
                if not 'gdal' in env['REQUESTED_PLUGINS']:
                    conf.parse_config('GDAL_CONFIG',checks='--libs')
                    conf.parse_config('GDAL_CONFIG',checks='--cflags')
                libname = conf.get_pkg_lib('GDAL_CONFIG','ogr')
                if libname:
                    details['lib'] = libname
                
        elif details['path'] and details['lib'] and details['inc']:
            backup = env.Clone().Dictionary()
            # Note, the 'delete_existing' keyword makes sure that these paths are prepended
            # to the beginning of the path list even if they already exist
            incpath = env['%s_INCLUDES' % details['path']]
            env.PrependUnique(CPPPATH = incpath,delete_existing=True)
            env.PrependUnique(LIBPATH = env['%s_LIBS' % details['path']],delete_existing=True)
            if not conf.CheckLibWithHeader(details['lib'], details['inc'], details['lang']):
                env.Replace(**backup)
                env['SKIPPED_DEPS'].append(details['lib'])

    # re-append the local paths for mapnik sources to the beginning of the list
    # to make sure they come before any plugins that were 'prepended'
    env.PrependUnique(CPPPATH = '#include', delete_existing=True)
    env.PrependUnique(CPPPATH = '#', delete_existing=True)
    env.PrependUnique(LIBPATH = '#src', delete_existing=True)

    # Decide which libagg to use
    # if we are using internal agg, then prepend to make sure
    # we link locally
    if env['INTERNAL_LIBAGG']:
        env.Prepend(CPPPATH = '#agg/include')
        env.Prepend(LIBPATH = '#agg')
    else:
        env.ParseConfig('pkg-config --libs --cflags libagg')
    
    if 'python' in env['BINDINGS']:
        # checklibwithheader does not work for boost_python since we can't feed it
        # multiple header files, so we fall back on a simple check for boost_python headers
        if not conf.CheckHeader(header='boost/python/detail/config.hpp',language='C++'):
            color_print(1,'Could not find required header files for boost python')
            env['MISSING_DEPS'].append('boost python')

        if env['CAIRO'] and conf.CheckPKGConfig('0.15.0') and conf.CheckPKG('pycairo'):
            env.ParseConfig('pkg-config --cflags pycairo')
            env.Append(CXXFLAGS = '-DHAVE_PYCAIRO')
        else:
            env['SKIPPED_DEPS'].extend(['pycairo'])
             
    #### End Config Stage for Required Dependencies ####
    
    if env['MISSING_DEPS']:
        # if required dependencies are missing, print warnings and then let SCons finish without building or saving local config
        color_print(1,'\nExiting... the following required dependencies were not found:\n   - %s' % '\n   - '.join([pretty_dep(dep) for dep in env['MISSING_DEPS']]))
        color_print(1,"\nSee the 'config.log' for details on possible problems.")
        if env['SKIPPED_DEPS']:
            color_print(4,'\nAlso, these OPTIONAL dependencies were not found:\n   - %s' % '\n   - '.join([pretty_dep(dep) for dep in env['SKIPPED_DEPS']]))
        color_print(4,"\nSet custom paths to these libraries and header files on the command-line or in a file called '%s'" % SCONS_LOCAL_CONFIG)
        color_print(4,"    ie. $ python scons/scons.py BOOST_INCLUDES=/usr/local/include/ BOOST_LIBS=/usr/local/lib")
        color_print(4, "\nOnce all required dependencies are found a local '%s' will be saved and then install:" % SCONS_LOCAL_CONFIG)
        color_print(4,"    $ sudo python scons/scons.py install")
        color_print(4,"\nTo view available path variables:\n    $ python scons/scons.py --help or -h")
        color_print(4,'\nTo view overall SCons help options:\n    $ python scons/scons.py --help-options or -H\n')
        color_print(4,'More info: http://trac.mapnik.org/wiki/MapnikInstallation')
        if not HELP_REQUESTED:
            Exit(1)
    else:
        # Save the custom variables in a SCONS_LOCAL_CONFIG
        # that will be reloaded to allow for `install` without re-specifying custom variables
        color_print(4,"\nAll Required dependencies found!\n")
        if env['USE_CONFIG']:
            if os.path.exists(SCONS_LOCAL_CONFIG):
                action = 'Overwriting and re-saving'
                os.unlink(SCONS_LOCAL_CONFIG)    
            else:
                action = 'Saving new'
            color_print(4,"%s file '%s'..." % (action,SCONS_LOCAL_CONFIG))
            color_print(4,"Will hold custom path variables from commandline and python config file(s)...")
            opts.Save(SCONS_LOCAL_CONFIG,env)
        else:
          color_print(4,"Did not use user config file, no custom path variables will be saved...")

        if env['SKIPPED_DEPS']:
            color_print(3,'\nNote: will build without these OPTIONAL dependencies:\n   - %s' % '\n   - '.join([pretty_dep(dep) for dep in env['SKIPPED_DEPS']]))
            print

        # fetch the mapnik version header in order to set the
        # ABI version used to build libmapnik.so on linux in src/SConscript
        abi = conf.GetMapnikLibVersion()
        abi_fallback = [0,7,1]
        if not abi:
            color_print(1,'Problem encountered parsing mapnik version, falling back to %s' % abi_fallback)
            env['ABI_VERSION'] = abi_fallback
        else:
            env['ABI_VERSION'] = abi


        # Common C++ flags.
        if env['THREADING'] == 'multi' :
            common_cxx_flags = '-D%s -DBOOST_SPIRIT_THREADSAFE -DMAPNIK_THREADSAFE ' % env['PLATFORM'].upper()
        else :
            common_cxx_flags = '-D%s ' % env['PLATFORM'].upper()

        
        svn_version = call('svnversion')
        if not svn_version == 'exported':
            pattern = r'(\d+)(.*)'
            try:
                env['SVN_REVISION'] = re.match(pattern,svn_version).groups()[0]
            except: pass
            
        # Mac OSX (Darwin) special settings
        if env['PLATFORM'] == 'Darwin':
            pthread = ''
            # Getting the macintosh version number, sticking as a compiler macro
            # for Leopard -- needed because different workarounds are needed than
            # for Tiger.
            # this was used for fribidi - not longer needed
            # but will retain logic for future use
            #if platform.mac_ver()[0].startswith('10.5'):
            #    common_cxx_flags += '-DOSX_LEOPARD '
        else:
            pthread = '-pthread'
        
        # Common debugging flags.
        debug_flags  = '-g -DDEBUG -DMAPNIK_DEBUG'
        ndebug_flags = '-DNDEBUG'
        
        if env['XML_DEBUG']: 
            common_cxx_flags += '-DMAPNIK_XML_DEBUG '
        
        # Customizing the C++ compiler flags depending on: 
        #  (1) the C++ compiler used; and
        #  (2) whether debug binaries are requested.
        if env['SUNCC']:
            if env['DEBUG']:
                env.Append(CXXFLAGS = common_cxx_flags + debug_flags)
            else:
                env.Append(CXXFLAGS = common_cxx_flags + '-O %s' % ndebug_flags)
        else:
            # Common flags for GCC.
            gcc_cxx_flags = '-ansi -Wall %s -ftemplate-depth-100 %s' % (pthread, common_cxx_flags)
        
            if env['DEBUG']:
                env.Append(CXXFLAGS = gcc_cxx_flags + '-O0 -fno-inline %s' % debug_flags)
            else: 
                env.Append(CXXFLAGS = gcc_cxx_flags + '-O%s -finline-functions -Wno-inline %s' % (env['OPTIMIZATION'],ndebug_flags))

        if 'python' in env['BINDINGS']:
            if not os.access(env['PYTHON'], os.X_OK):
                color_print(1,"Cannot run python interpreter at '%s', make sure that you have the permissions to execute it." % env['PYTHON'])
                Exit(1)
            
            res = os.popen('''%s -c "print 1"''' % env['PYTHON'])
            if res.read() == '1':
                py3 = False
            else:
                py3 = True
            #sys.version_info.major == 3

            if py3:
                sys_prefix = '''%s -c "import sys; print(sys.prefix)"''' % env['PYTHON']
            else:
                sys_prefix = '''%s -c "import sys; print sys.prefix"''' % env['PYTHON']                
            env['PYTHON_SYS_PREFIX'] = call(sys_prefix)
            
            if HAS_DISTUTILS:                        
                if py3:
                    sys_version = '''%s -c "from distutils.sysconfig import get_python_version; print(get_python_version())"''' % env['PYTHON']
                else:
                    sys_version = '''%s -c "from distutils.sysconfig import get_python_version; print get_python_version()"''' % env['PYTHON']                    
                env['PYTHON_VERSION'] = call(sys_version)
                
                if py3:
                    py_includes = '''%s -c "from distutils.sysconfig import get_python_inc; print(get_python_inc())"''' % env['PYTHON']                
                else:
                    py_includes = '''%s -c "from distutils.sysconfig import get_python_inc; print get_python_inc()"''' % env['PYTHON']
                env['PYTHON_INCLUDES'] = call(py_includes)
                
                # Note: we use the plat_specific argument here to make sure to respect the arch-specific site-packages location
                if py3:
                    site_packages = '''%s -c "from distutils.sysconfig import get_python_lib; print(get_python_lib(plat_specific=True))"''' % env['PYTHON']
                else:
                    site_packages = '''%s -c "from distutils.sysconfig import get_python_lib; print get_python_lib(plat_specific=True)"''' % env['PYTHON']                    
                env['PYTHON_SITE_PACKAGES'] = call(site_packages)
            else:
                env['PYTHON_SYS_PREFIX'] = os.popen('''%s -c "import sys; print sys.prefix"''' % env['PYTHON']).read().strip()
                env['PYTHON_VERSION'] = os.popen('''%s -c "import sys; print sys.version"''' % env['PYTHON']).read()[0:3]
                env['PYTHON_INCLUDES'] = env['PYTHON_SYS_PREFIX'] + '/include/python' + env['PYTHON_VERSION']
                env['PYTHON_SITE_PACKAGES'] = env['DESTDIR'] + '/' + env['PYTHON_SYS_PREFIX'] + '/' + env['LIBDIR_SCHEMA'] + '/python' + env['PYTHON_VERSION'] + '/site-packages/'
        
            # if user-requested custom prefix fall back to manual concatenation for building subdirectories       
            if env['PYTHON_PREFIX']:
                py_relative_install = env['LIBDIR_SCHEMA'] + '/python' + env['PYTHON_VERSION'] + '/site-packages/' 
                env['PYTHON_INSTALL_LOCATION'] = env['DESTDIR'] + '/' + env['PYTHON_PREFIX'] + '/' +  py_relative_install            
            else:
                env['PYTHON_INSTALL_LOCATION'] = env['DESTDIR'] + '/' + env['PYTHON_SITE_PACKAGES']
               
            majver, minver = env['PYTHON_VERSION'].split('.')

            # TODO - this needs to be moved up... 
            env.AppendUnique(CPPPATH = env['PYTHON_INCLUDES']) 
            if not conf.CheckHeader(header='Python.h',language='C'): 
                color_print(1,'Could not find required header files for the Python language (version %s)' % env['PYTHON_VERSION']) 
                env['MISSING_DEPS'].append('python %s development headers' % env['PYTHON_VERSION'])        

            if (int(majver), int(minver)) < (2, 2):
                color_print(1,"Python version 2.2 or greater required")
                Exit(1)
        
            color_print(4,'Bindings Python version... %s' % env['PYTHON_VERSION'])
            color_print(4,'Python %s prefix... %s' % (env['PYTHON_VERSION'], env['PYTHON_SYS_PREFIX']))
            color_print(4,'Python bindings will install in... %s' % os.path.normpath(env['PYTHON_INSTALL_LOCATION']))


        # if requested, sort LIBPATH and CPPPATH one last time before saving...
        if env['PRIORITIZE_LINKING']:
            conf.prioritize_paths()
        
        # finish config stage and pickle results
        env = conf.Finish()
        env_cache = open(SCONS_CONFIGURE_CACHE, 'w')
        pickle_dict = {}
        for i in pickle_store:
            pickle_dict[i] = env.get(i)
        pickle.dump(pickle_dict,env_cache)
        env_cache.close()
        # fix up permissions on configure outputs
        # this is hackish but avoids potential problems
        # with a non-root configure following a root install
        # that also triggered a re-configure
        try:
            os.chmod(SCONS_CONFIGURE_CACHE,0666)
        except: pass
        try:
            os.chmod(SCONS_LOCAL_CONFIG,0666)
        except: pass
        try:
            os.chmod('.sconsign.dblite',0666)
        except: pass
        try:
            os.chmod(SCONS_LOCAL_LOG,0666)
        except: pass
        try:
            for item in glob('%s/*' % SCONF_TEMP_DIR):
                os.chmod(item,0666)
        except: pass

        if 'configure' in command_line_args:
            color_print(4,'\n*Configure complete*\nNow run "python scons/scons.py" to build or "python scons/scons.py install" to install')
            if not HELP_REQUESTED:
                Exit(0)

# autogenerate help on default/current SCons options
Help(opts.GenerateHelpText(env))

#env.Prepend(CPPPATH = '/usr/local/include')
#env.Prepend(LIBPATH = '/usr/local/lib')

#### Builds ####
if not HELP_REQUESTED:
    # export env so it is available in Sconscript files
    Export('env')
    
    
    if env['FAST']:
        # caching is 'auto' by default in SCons
        # But let's also cache implicit deps...
        EnsureSConsVersion(0,98)
        SetOption('implicit_cache', 1)
        env.Decider('MD5-timestamp')
        SetOption('max_drift', 1)
        
    else:
        # Set the cache mode to 'force' unless requested, avoiding hidden caching of Scons 'opts' in '.sconsign.dblite'
        # This allows for a SCONS_LOCAL_CONFIG, if present, to be used as the primary means of storing paths to successful build dependencies
        SetCacheMode('force')
    
    if env['JOBS'] > 1:
        SetOption("num_jobs", env['JOBS'])  
        
    # Build agg first, doesn't need anything special
    if env['INTERNAL_LIBAGG']:
        SConscript('agg/SConscript')
    
    # Build the core library
    SConscript('src/SConscript')
    
    # Build the requested and able-to-be-compiled input plug-ins
    GDAL_BUILT = False
    OGR_BUILT = False
    for plugin in env['REQUESTED_PLUGINS']:
        details = env['PLUGINS'][plugin]
        if details['lib'] in env['LIBS']:
            SConscript('plugins/input/%s/SConscript' % plugin)
            if plugin == 'ogr': OGR_BUILT = True
            if plugin == 'gdal': GDAL_BUILT = True
            if plugin == 'ogr' or plugin == 'gdal':
                if GDAL_BUILT and OGR_BUILT:
                    env['LIBS'].remove(details['lib'])
            else:
                env['LIBS'].remove(details['lib'])
        elif not details['lib']:
            # build internal shape and raster plugins
            SConscript('plugins/input/%s/SConscript' % plugin)
    
    # Build the c++ rundemo app if requested
    if env['DEMO']:
        SConscript('demo/c++/SConscript')
    
    # Build the pgsql2psqlite app if requested
    if env['PGSQL2SQLITE']:
        SConscript('utils/pgsql2sqlite/SConscript')
        
    # Build shapeindex and remove its dependency from the LIBS
    if 'boost_program_options%s' % env['BOOST_APPEND'] in env['LIBS']:
        SConscript('utils/shapeindex/SConscript')
        env['LIBS'].remove('boost_program_options%s' % env['BOOST_APPEND'])
    else :
        color_print(1,"WARNING: Cannot find boost_program_options. 'shapeindex' won't be available")
        
    # Build the Python bindings
    if 'python' in env['BINDINGS']:
        SConscript('bindings/python/SConscript')
    
    # Configure fonts and if requested install the bundled DejaVu fonts
    SConscript('fonts/SConscript')