liblxqt: fix cross

srcpkgs/liblxqt/template

@@ -13,6 +13,11 @@ homepage="http://lxqt.org/"
 distfiles="https://github.com/lxde/liblxqt/releases/download/${version}/liblxqt-${version}.tar.xz"
 checksum=487dc42ceb611f53024c531d5550bd0d4fe8cbfe3dbf3711faba5db6ee6d415d
 
+post_configure() {
+	# Replace -isystem with -I to avoid "#include_next <stdlib.h>" file not found
+	find -name flags.make -exec sed -i "{}" -e "s;-isystem;-I;g" \;
+}
+
 liblxqt-devel_package() {
 	short_desc+=" - development files"
 	depends="${makedepends} ${sourcepkg}>=${version}_${revision}"