--- configure.orig	2017-07-14 14:53:54.062844000 +0200
+++ configure	2017-07-14 14:55:47.269845000 +0200
@@ -713,6 +713,7 @@
 }
 
 # build qmake
+if [ '!' -f "$outpath/bin/qmake" ] ; then 
     echo "Creating qmake..."
     mkdir -p "$outpath/qmake" || exit
 
@@ -814,6 +815,7 @@
         fi
         echo "Done."
     fi
+fi # Creating qmake
 
 #-------------------------------------------------------------------------------
 # create a qt.conf for the Qt build tree itself