--- a/Makefile
+++ b/Makefile
@@ -282,7 +282,7 @@ include support/${OSENV}.mk
 # Bundle files
 $(BUILDDIR)/bundle.o: $(BUILDDIR)/bundle.c
 	@mkdir -p $(dir $@)
-	$(CC) -I${CURDIR}/src -c -o $@ $<
+	$(CC) $(CFLAGS) -I${CURDIR}/src -c -o $@ $<
 
 $(BUILDDIR)/bundle.c:
 	@mkdir -p $(dir $@)