File howl-respect-cflags.patch of Package howl

Index: howl-0.5.1/src/Makefile
===================================================================
--- howl-0.5.1.orig/src/Makefile
+++ howl-0.5.1/src/Makefile
@@ -19,7 +19,7 @@ LPEG = deps/$(LPEG_VER)
 LPEG_OBJECT = $(LPEG)/lpeg.o
 LPEG_URL = http://nordman.org/mirror/lpeg/$(LPEG_VER).tar.gz
 
-CFLAGS = -Wall -O2 -g $(LUAJIT_CFLAGS) $(GTK_CFLAGS) -DHOWL_PREFIX=$(PREFIX)
+CFLAGS += $(LUAJIT_CFLAGS) $(GTK_CFLAGS) -DHOWL_PREFIX=$(PREFIX)
 ARCHIVES = $(LUAJIT_ARCHIVE)
 LIBS = -lm -ldl ${GTK_LIBS}
 ifeq ($(UNAME_S),FreeBSD)