--- a/Makefile	2015-07-27 11:40:07.000000000 +0200
+++ b/Makefile	2017-10-22 11:26:50.381365663 +0200
@@ -1,11 +1,11 @@
 PROJECT=mcp23s17
 SOURCES=src/mcp23s17.c
-LIBRARY=static
-INCPATHS=
-LIBPATHS=
-LDFLAGS=
-CFLAGS=-c -Wall
-CC=gcc
+CC ?= gcc
+CFLAGS += -Wall
+LIBRARY=shared
+INCPATHS =
+LIBPATHS =
+LDFLAGS +=
 
 # ------------ MAGIC BEGINS HERE -------------
 
@@ -31,20 +31,20 @@
     ifeq "$(LIBRARY)" "static"
 	ar rcs $(BINARY) $(OBJECTS)
     else
-	$(CC) $(LIBFLAGS) $(OBJECTS) $(LDFLAGS) -o $@
+	$(CC) $(CFLAGS) $(LIBFLAGS) $(OBJECTS) $(LDFLAGS) -o $@
     endif
 
 .c.o:
-	$(CC) $(INCFLAGS) $(CFLAGS) -fPIC $< -o $@
+	$(CC) $(INCFLAGS) $(CFLAGS) $(LDFLAGS) -fPIC $< -o $@
 
 distclean: clean
 	rm -f $(BINARY)
 
 example: example.c
-	gcc -o example example.c -Isrc/ -L. -lmcp23s17
+	$(CC) $(CFLAGS) $(LDFLAGS) -o example example.c -Isrc/ -L. -lmcp23s17
 
 interrupt_example: interrupt_example.c
-	gcc -o interrupt_example interrupt_example.c -Isrc/ -L. -lmcp23s17
+	$(CC) $(CFLAGS) $(LDFLAGS) -o interrupt_example interrupt_example.c -Isrc/ -L. -lmcp23s17
 
 clean:
 	rm -f $(OBJECTS)