diff --git a/configure.ac b/configure.ac
index 4256cff2..71f7332a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -245,6 +245,8 @@ if test "${xslstylesheetsdir}" = "detect"; then
 	xslstylesheetsdir="no"
 	for f in \
 		/usr/share/xml/docbook/stylesheet/nwalsh \
+		/opt/local/share/xsl/docbook-xsl \
+		/sw/share/xml/xsl/docbook-xsl \
 		/usr/share/sgml/docbook/*; do
 
 		test -e "${f}/html/docbook.xsl" && xslstylesheetsdir="${f}"