tiv: fix PIE

See #4572

srcpkgs/tiv/template

@@ -1,7 +1,7 @@
 # Template file for 'tiv'
 pkgname=tiv
 version=0.1
-revision=3
+revision=4
 build_style=gnu-makefile
 hostmakedepends="pkg-config vala"
 makedepends="vala-devel glib-devel gdk-pixbuf-devel libjpeg-turbo-devel"
@@ -12,6 +12,22 @@ license="MIT"
 distfiles="http://github.com/radare/$pkgname/archive/$version.tar.gz"
 checksum=4aeae8b132ff507084ed1365652dda96ee245e003a4b409d3a304ce0871802f3
 
+pre_build() {
+	local _p _cflags _ldflags
+
+	# Prepend every CFLAGS item with -X
+	for _p in ${CFLAGS}; do
+		_cflags="${_cflags} -X $_p"
+	done
+	# Prepend every LDFLAGS item with -X
+	for _p in ${LDFLAGS}; do
+		_ldflags="${_ldflags} -X $_p"
+	done
+	# Add to VALACFLAGS
+	sed -i Makefile \
+		-e "/VALAC.*/a VALACFLAGS=$_cflags $_ldflags" \
+		-e 's;${VALAC};$(VALAC) $(VALACFLAGS);'
+}
 pre_install() {
 	vmkdir usr/bin
 }