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diff --git a/Makefile b/Makefile
index 747229a..fa5cf9a 100644
--- a/Makefile
+++ b/Makefile
@@ -4,7 +4,7 @@ PREFIX    = /usr/local
 MANPREFIX = $(PREFIX)/share/man
 
 CC      = gcc
-CFLAGS  = -std=c99 -Wall -pedantic -O2 -I$(PREFIX)/include -DHAVE_GIFLIB
+CFLAGS += -std=c99 -Wall -pedantic -O2 -I$(PREFIX)/include -DHAVE_GIFLIB
 LDFLAGS = -L$(PREFIX)/lib
 LIBS    = -lX11 -lImlib2 -lgif