diff --git a/externals/CMakeLists.txt b/externals/CMakeLists.txt
index e028760549d5aea12d36b1ee96602aeabe271e18..addb49ef2089937eef6adad6ac1bf0a5d5c2c9de 100644
--- a/externals/CMakeLists.txt
+++ b/externals/CMakeLists.txt
@@ -1240,8 +1240,9 @@ LCGPackage_Add(
   INSTALL_COMMAND ${MAKE} -j1 install
           COMMAND ${CMAKE_SOURCE_DIR}/externals/Qt_postinstall.sh <INSTALL_DIR>
   BUILD_IN_SOURCE 1
+  ENVIRONMENT PKG_CONFIG_PATH=/usr/lib/pkgconfig/lib:/usr/lib64/pkgconfig/:/usr/share/pkgconfig:$ENV{${PKG_CONFIG_PATH}}
   DEPENDS Python fontconfig ${Qt5_extra_depends}
-  REVISION 1
+  REVISION 2
 )
 
 if (LCG_TARGET MATCHES mac OR LCG_TARGET MATCHES ubuntu)