sed Makefile instead of setting in env

gen_compile.sh

@@ -567,7 +567,8 @@ compile_unionfs_fuse() {
 		tar -zxpf "${FUSE_SRCTAR}"
 		cd ..
 		print_info 1 'unionfs-fuse: >> Compiling...'
-		CFLAGS="-Ifuse_tmp/${FUSE_DIR}/include" MAKE=${UTILS_MAKE} compile_generic "" ""
+		sed -i "/^CFLAGS/s:^\\(.*\\)$:\\1 -Ifuse_tmp/${FUSE_DIR}/include:" Makefile
+		MAKE=${UTILS_MAKE} compile_generic "" ""
 		print_info 1 'unionfs-fuse: >> Copying to cache...'
 		[ -f "${TEMP}/${UNIONFS_FUSE_DIR}/src/unionfs" ] ||
 			gen_die 'unionfs binary does not exist!'