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