--- config/mt-gnu
+++ config/mt-gnu
@@ -1,2 +1,2 @@
-CXXFLAGS_FOR_TARGET = $(CXXFLAGS) $(SYSROOT_CFLAGS_FOR_TARGET) \
+CXXFLAGS_FOR_TARGET += -g         $(SYSROOT_CFLAGS_FOR_TARGET) \
 	$(DEBUG_PREFIX_CFLAGS_FOR_TARGET) -D_GNU_SOURCE