lxqt-panel: fix cross

srcpkgs/lxqt-panel/template

@@ -4,7 +4,7 @@ version=0.11.1
 revision=1
 build_style=cmake
 configure_args="-DPULL_TRANSLATIONS=0"
-hostmakedepends="pkg-config"
+hostmakedepends="pkg-config qt5-host-tools liblxqt-devel"
 makedepends="libxkbcommon-devel liblxqt-devel ksolid-devel kguiaddons-devel
  lxqt-globalkeys-devel alsa-lib-devel pulseaudio-devel libstatgrab-devel
  menu-cache-devel libsensors-devel libXcomposite-devel libsysstat-devel
@@ -15,3 +15,7 @@ license="LGPL-2.1"
 homepage="http://lxqt.org/"
 distfiles="https://github.com/lxde/lxqt-panel/releases/download/${version}/lxqt-panel-${version}.tar.xz"
 checksum=cfbe1862a2614ff8e22bc8db795a6cbce106243822d90370970eb0bbd5aea5e0
+
+post_configure() {
+	find -name flags.make -exec sed -i "{}" -e"s;-isystem;-I;g" \;
+}