zathura: fix CFLAGS and LDFLAGS

srcpkgs/zathura/template

@@ -1,7 +1,7 @@
 # Template file for 'zathura'
 pkgname=zathura
 version=0.3.3
-revision=1
+revision=2
 build_style=gnu-makefile
 # COLOR=0 to avoid "tput not found" spam in the build output
 make_build_args="COLOR=0"
@@ -15,6 +15,11 @@ short_desc="A highly customizable and functional document viewer"
 distfiles="http://pwmt.org/projects/${pkgname}/download/${pkgname}-${version}.tar.gz"
 checksum=3347decfc8d4b918a6bca1d44657c3b97d4afcea3c8c1f162c57198b13e8dce7
 
+pre_build() {
+	sed -i 's/^\(CFLAGS *+=\)/override \1/' config.mk
+	sed -i 's/^\(LDFLAGS *+=\)/override \1/' config.mk
+}
+
 post_install() {
 	vlicense LICENSE
 }