diff --git a/SConstruct b/SConstruct
index 25a054795..6179e2dad 100644
--- a/SConstruct
+++ b/SConstruct
@@ -410,8 +410,8 @@ opts.AddVariables(
     PathVariable('WEBP_INCLUDES', 'Search path for libwebp include files', '/usr/include', PathVariable.PathAccept),
     PathVariable('WEBP_LIBS','Search path for libwebp library files','/usr/' + LIBDIR_SCHEMA_DEFAULT, PathVariable.PathAccept),
     BoolVariable('PROJ', 'Build Mapnik with proj support to enable transformations between many different projections', 'True'),
-    PathVariable('PROJ_INCLUDES', 'Search path for PROJ.4 include files', '/usr/include', PathVariable.PathAccept),
-    PathVariable('PROJ_LIBS', 'Search path for PROJ.4 library files', '/usr/' + LIBDIR_SCHEMA_DEFAULT, PathVariable.PathAccept),
+    PathVariable('PROJ_INCLUDES', 'Search path for libproj include files', '/usr/include', PathVariable.PathAccept),
+    PathVariable('PROJ_LIBS', 'Search path for libproj library files', '/usr/' + LIBDIR_SCHEMA_DEFAULT, PathVariable.PathAccept),
     ('PG_INCLUDES', 'Search path for libpq (postgres client) include files', ''),
     ('PG_LIBS', 'Search path for libpq (postgres client) library files', ''),
     ('FREETYPE_INCLUDES', 'Search path for Freetype include files', ''),