--- Makefile.orig	2021-11-07 11:31:27 UTC
+++ Makefile
@@ -1,7 +1,7 @@
 # minimal CFLAGS definition (try if compilation fails with default CFLAGS)
 #CFLAGS  := $(shell imlib2-config --cflags)
 # default CFLAGS definition
-CFLAGS  := -D_FORTIFY_SOURCE=2 -Wall -W -Wextra -pedantic -fstack-protector-all $(shell imlib2-config --cflags) -O3
+CFLAGS  := $(CFLAGS) -D_FORTIFY_SOURCE=2 $(shell imlib2-config --cflags)
 LDLIBS  := -lm $(shell imlib2-config --libs)
 PREFIX  := /usr/local
 BINDIR  := $(PREFIX)/bin
