Respect CC, CFLAGS, & LDFLAGS.
Drop DEPRECATED flags for bug #387833.
Fix underlinking for bug #369453.
--- a/Makefile
+++ b/Makefile
@@ -1,10 +1,10 @@
 all: gromit
 
 proptest: proptest.c
-	gcc -o proptest proptest.c `gtk-config --libs --cflags`
+	$(CC) $(CPPFLAGS) $(CFLAGS) $(LDFLAGS) -o proptest proptest.c `gtk-config --libs --cflags`
 
 propertywatch: propertywatch.c
-	gcc -o propertywatch propertywatch.c `gtk-config --libs --cflags`
+	$(CC) $(CPPFLAGS) $(CFLAGS) $(LDFLAGS) -o propertywatch propertywatch.c `gtk-config --libs --cflags`
 
 gromit: gromit.c Makefile
-	gcc -DG_DISABLE_DEPRECATED -DGDK_PIXBUF_DISABLE_DEPRECATED -DGDK_DISABLE_DEPRECATED -DPANGO_DISABLE_DEPRECATED -DGDK_MULTIHEAD_SAFE -DGTK_MULTIHEAD_SAFE -o gromit gromit.c -Wall `pkg-config --libs --cflags gtk+-2.0`
+	$(CC) $(CPPFLAGS) $(CFLAGS) $(LDFLAGS) -DGDK_MULTIHEAD_SAFE -DGTK_MULTIHEAD_SAFE -o gromit gromit.c -Wall `$(PKG_CONFIG) --libs --cflags gtk+-2.0 x11` -lm