lxqt-config: fix build with Qt5 >= 5.5.0

srcpkgs/lxqt-config/template

@@ -1,7 +1,7 @@
 # Template file for 'lxqt-config'
 pkgname=lxqt-config
 version=0.9.0
-revision=1
+revision=2
 build_style=cmake
 configure_args="-DUSE_QT5=1"
 hostmakedepends="cmake pkg-config"
@@ -12,3 +12,9 @@ license="LGPL-2.1"
 homepage="http://lxqt.org/"
 distfiles="http://downloads.lxqt.org/lxqt/${version}/${pkgname}-${version}.tar.xz"
 checksum=9d6b0d21846ac5d9c62c5806ce04383b92708ab7bd095b46d0ac9fbb3f84b913
+
+pre_configure() {
+	# Need to explicitly include QObject with Qt5 >= 5.5.0
+	sed -i lxqt-config-monitor/monitor.h \
+		-e "/#include <QStringList>/i #include<QObject>"
+}