Respect the user's pkg-config, remove "-O2 -Wall" flags, don't call gcc directly
--- a/Makefile
+++ b/Makefile
@@ -1,16 +1,17 @@
-GTK_INCLUDE = `pkg-config gtk+-2.0 --cflags`
-GTK_LIB = `pkg-config gtk+-2.0 --libs`
+PKG_CONFIG ?= pkg-config
+GTK_INCLUDE = $(shell ${PKG_CONFIG} gtk+-2.0 --cflags)
+GTK_LIB = $(shell ${PKG_CONFIG} gtk+-2.0 --libs)
 
-FLAGS = -O2 -Wall -fPIC $(GTK_INCLUDE)
+FLAGS = -fPIC $(GTK_INCLUDE)
 LIBS = $(GTK_LIB)
 LFLAGS = -shared
 
-CC = gcc $(CFLAGS) $(FLAGS)
+CC = $(CC)
 
 OBJS = gkrellstock.o
 
 gkrellstock.so: $(OBJS)
-	$(CC) $(LDFLAGS) $(OBJS) -o gkrellstock.so $(LFLAGS) $(LIBS) 
+	$(CC) $(CFLAGS) $(FLAGS) $(LDFLAGS) $(OBJS) -o gkrellstock.so $(LFLAGS) $(LIBS)
 
 clean:
 	rm -f *.o core *.so* *.bak *~