Search the path for moc-tqt

(cherry picked from commit 7b10d93d32)

configure.ac

@@ -484,7 +484,7 @@ if test "x$HAVE_TQT" = "xyes" ; then
         AC_SUBST(QT3_CFLAGS)
         AC_SUBST(QT3_LIBS)
 	    QT3_PREFIX="`$PKG_CONFIG --variable=prefix qt-mt`/bin"
-        AC_PATH_PROGS(MOC_QT3, [moc-tqt], no, [$QT3_PREFIX])
+        AC_PATH_PROGS(MOC_QT3, [moc-tqt], no, [$QT3_PREFIX:$PATH])
         if test "$MOC_QT3" = no; then
             AC_MSG_ERROR([Could not find moc-tqt])
         fi