zathura-pdf-poppler: fix CFLAGS and LDFLAGS

srcpkgs/zathura-pdf-poppler/template

@@ -1,7 +1,7 @@
 # Template file for 'zathura-pdf-poppler'
 pkgname=zathura-pdf-poppler
 version=0.2.5
-revision=4
+revision=5
 build_style=gnu-makefile
 maintainer="Dominik Honnef <dominik@honnef.co>"
 hostmakedepends="pkg-config"
@@ -13,6 +13,11 @@ short_desc="PDF support for zathura (using poppler)"
 distfiles="http://pwmt.org/projects/${pkgname}/download/${pkgname}-${version}.tar.gz"
 checksum=60b327596d65bcd39edd5bf05b8cca8f9b658f51e626611ea99247a49b860cac
 
+pre_build() {
+	sed -i 's/^\(CFLAGS *+=\)/override \1/' config.mk
+	sed -i 's/^\(LDFLAGS *+=\)/override \1/' config.mk
+}
+
 post_install() {
 	vlicense LICENSE
 }