Adding an option for building a shared library because cgo can't link static libs.

Makefile

 CC=g++
-CFLAGS=-c -Wall -O2
-LDFLAGS=
+CFLAGS=-c -Wall -O2 -fPIC
+LDFLAGS= -fPIC
 SOURCES = \
 	context.cpp functions.cpp document.cpp \
 	document_parser.cpp eval_apply.cpp node.cpp \
@@ -11,8 +11,11 @@ OBJECTS = $(SOURCES:.cpp=.o)
 all: $(OBJECTS)
 	ar rvs libsass.a $(OBJECTS)
 
+shared: $(OBJECTS)
+	gcc -shared -o libsass.so *.o
+
 .cpp.o:
 	$(CC) $(CFLAGS) $< -o $@
 
 clean:
-	rm -rf *.o *.a
\ No newline at end of file
+	rm -rf *.o *.a *.so
\ No newline at end of file