+AC_SUBST(XSL_DIR)
+AC_ARG_WITH(xsl,[ --with-xsl[=DIR] use Docbook XSL in DIR/{htmlhelp,xhtml}],
+[
+ if test -f "$withval/htmlhelp/htmlhelp.xsl"; then
+ XSL_DIR=$withval
+ fi
+],[
+ AC_MSG_CHECKING(for htmlhelp.xsl)
+ for d in /usr/share/sgml/docbook/stylesheet/xsl/nwalsh \
+ /usr/share/sgml/docbook/xsl-stylesheets-1.*
+ do
+ if test -f $d/htmlhelp/htmlhelp.xsl; then
+ AC_MSG_RESULT($d)
+ XSL_DIR=$d
+ break
+ fi
+ done
+ if test -z "$XSL_DIR"; then
+ AC_MSG_RESULT(Not found)
+ fi
+])