-libmemcached_libmemcached_la_CFLAGS= -DBUILDING_LIBMEMCACHED
-libmemcached_libmemcached_la_CXXFLAGS= -DBUILDING_LIBMEMCACHED
+libmemcached_libmemcached_la_CFLAGS=
+libmemcached_libmemcached_la_CXXFLAGS=
+
+libmemcached_libmemcached_la_CFLAGS+= -DBUILDING_LIBMEMCACHED
+libmemcached_libmemcached_la_CXXFLAGS+= -DBUILDING_LIBMEMCACHED