add sample Makefile for local dev

plugins/input/templates/helloworld/Makefile

@@ -0,0 +1,30 @@
+CXX = clang++
+
+CXXFLAGS = $(shell mapnik-config --cflags)
+
+LIBS = $(shell mapnik-config --libs --ldflags --dep-libs)
+
+SRC = $(wildcard *.cpp)
+
+OBJ = $(SRC:.cpp=.o)
+
+BIN = hello.input
+
+all : $(SRC) $(BIN)
+
+$(BIN) : $(OBJ)
+	$(CXX) -shared $(OBJ) $(LIBS) -o $@
+
+.cpp.o :
+	$(CXX) -c $(CXXFLAGS) $< -o $@
+
+.PHONY : clean
+
+clean:
+	rm -f $(OBJ)
+	rm -f $(BIN)
+
+deploy:
+	cp hello.input $(shell mapnik-config --input-plugins)
+
+install: clean all deploy