--- Makefile.orig	2016-12-01 13:14:44 UTC
+++ Makefile
@@ -1,5 +1,5 @@
-CFLAGS := -D_FORTIFY_SOURCE=2 -Wall -W -Wextra -pedantic -Werror -pedantic-errors $(shell imlib2-config --cflags) -O3
-LDLIBS := -lm $(shell imlib2-config --libs)
+CFLAGS += -D_FORTIFY_SOURCE=2 $(shell imlib2-config --cflags)
+LDLIBS += -lm $(shell imlib2-config --libs)
 PREFIX := /usr/local
 BINDIR := $(PREFIX)/bin
 MANDIR := $(PREFIX)/share/man/man1