-g_mime_test: g_mime_test.c
- $(CC) g_mime_test.c `pkg-config --cflags --libs gmime-2.4` -o g_mime_test
+# We make all targets depend on the Makefiles themselves.
+global_deps = Makefile Makefile.local \
+ $(subdirs:%=%/Makefile) $(subdirs:%=%/Makefile.local)