Index: autoconf/configure.in
--- autoconf/configure.in.orig
+++ autoconf/configure.in
@@ -456,7 +456,7 @@ dnl look for Qt4
       BAT_DIR=src/qt-console
    else
 dnl look for Qt5
-     abc=`$PKG_CONFIG Qt5Gui`
+     abc=`PKG_CONFIG_PATH="/usr/local/lib/qt6/pkgconfig${PKG_CONFIG_PATH:+:$PKG_CONFIG_PATH}" $PKG_CONFIG --exists Qt6Gui`
      pkg=$?
      if test $pkg = 0; then
 	BAT_DIR="src/qt-console src/qt-console/tray-monitor"
