These files are generated during the build

diff -rup po/POTFILES.skip.orig po/POTFILES.skip
--- a/po/POTFILES.skip
+++ b/po/POTFILES.skip
@@ -5,3 +5,7 @@ lxsession-default-apps/combobox.c
 data/lxpolkit.desktop.in.in
 # bug of intltool with automake 1.15
 sub/data/lxpolkit.desktop.in
+
+data/lxpolkit.desktop.in
+lxpolkit/main.c
+lxsession/app.c
