+dnl rm -rf tre-$tre_version
+dnl if test "x$ac_cv_path_GUNZIP" = "x" ; then
+dnl tar xfz tre.tar.gz
+dnl else
+dnl cp tre.tar.gz tre.tar.gz.bak
+dnl gunzip -f tre.tar.gz
+dnl cp tre.tar.gz.bak tre.tar.gz
+dnl tar xf tre.tar
+dnl fi
+dnl AC_MSG_RESULT(configuring TRE regex library)
+dnl cd tre-$tre_version
+dnl tre_prefix=$prefix
+dnl if test $tre_prefix = "NONE"; then
+dnl tre_prefix="$HOME"
+dnl fi
+dnl ./configure --disable-agrep --disable-shared --disable-system-abi --disable-wchar --disable-multibyte --prefix=$tre_prefix || exit 1
+dnl
+dnl AC_MSG_RESULT(compiling TRE regex library)
+dnl $ac_cv_prog_MAKER || exit 1
+dnl AC_MSG_RESULT(installing TRE regex library)
+dnl $ac_cv_prog_MAKER install || exit 1
+dnl TREINCDIR="$tre_prefix/include"
+dnl AC_SUBST(TREINCDIR)
+dnl if test "x$ac_cv_path_PKGCONFIG" = "x" ; then
+dnl TRELIBS="-L$tre_prefix/lib -ltre"
+dnl else
+dnl TRELIBS=`$ac_cv_path_PKGCONFIG --libs tre.pc`
+dnl fi
+dnl AC_SUBST(TRELIBS)
+dnl
+dnl cd $cur_dir
+
+dnl libTRE (regex library) checking
+withval=''
+AC_ARG_WITH(tre, [ --with-tre=PATH Base path to where libtre is installed, such that PATH/lib/libtre.so and PATH/include/tre/regex.h exist.], )
+if test "x$withval" != "x"; then
+ AC_MSG_RESULT(Using include dir $withval to find libtre)
+ CPPFLAGS="-I$withval/include -L$withval/lib"
+ LIBS="$LIBS -L$withval/lib"