--- sxiv-1.2/Makefile
+++ sxiv-1.2/Makefile
@@ -3,10 +3,9 @@
 PREFIX    = /usr/local
 MANPREFIX = $(PREFIX)/share/man
 
-CC       = gcc
-CFLAGS   = -std=c99 -Wall -pedantic -O2
-CPPFLAGS = -I$(PREFIX)/include -D_XOPEN_SOURCE=500 -DHAVE_GIFLIB
-LDFLAGS  = -L$(PREFIX)/lib
+CC       ?= gcc
+CFLAGS   += -std=c99 -Wall -pedantic -O2
+CPPFLAGS += -D_XOPEN_SOURCE=500 -DHAVE_GIFLIB
 LIBS     = -lX11 -lImlib2 -lgif
 
 SRC = commands.c exif.c image.c main.c options.c thumbs.c util.c window.c