Index: configure.in
===================================================================
--- configure.in
+++ configure.in	2010-03-23 12:53:09.000000000 +0100
@@ -956,7 +956,7 @@
 if [[ "x$ac_cv_use_libqt4" = "xyes" ]]; then
     AC_MSG_CHECKING([for Qt4 >= 4.2.0 using pkg-config])
     pkgd="/usr/lib/qt4/$ARCHLIB/pkgconfig"
-    if [[ -d "$pkgd" ]]; then
+    if [[ -d "$pkgd" ]] && ! pkg-config QtCore ; then
 	export PKG_CONFIG_LIBDIR="$pkgd"
     fi
     verqt=`pkg-config --modversion QtCore 2>/dev/null`