fbreader: fix PIE

See #4572

srcpkgs/fbreader/template

@@ -1,7 +1,7 @@
 # Template file for 'fbreader'
 pkgname=fbreader
 version=0.99.4
-revision=1
+revision=2
 build_style=gnu-makefile
 hostmakedepends="pkg-config"
 makedepends="fribidi-devel bzip2-devel expat-devel libcurl-devel libunibreak-devel sqlite-devel qt-devel zlib-devel"
@@ -12,6 +12,12 @@ homepage="http://www.fbreader.org/"
 distfiles="http://www.fbreader.org/files/desktop/${pkgname}-sources-${version}.tgz"
 checksum=3d7c31d5ea314589d2a963290ad16f4d3d631a41e802b8b39f8be0c9f71eb8e9
 
+post_configure() {
+	sed -i makefiles/arch/desktop.mk \
+		-e"s;^\(CFLAGS.*=.*\);& $CFLAGS;" \
+		-e"s;^\(CXXFLAGS.*=.*\);& $CXXFLAGS;" \
+		-e"s;^\(LDFLAGS.*=.*\);& $LDFLAGS;"
+}
 do_build() {
 	sed -e "s:-llinebreak:-lunibreak:" -i makefiles/config.mk zlibrary/text/Makefile
 	make -j1 -C zlibrary/core TARGET_ARCH=desktop UI_TYPE=dummy