[patch] to build docs on Mac OS X El Capitan with MacPorts

The attached patch was required to get the docs to build on Mac OS X 10.11.1 (15B42) with MacPorts 2.3.4. After changing docbook.m4 ‘autoreconf’ has to be run. This patch does not include the new version of ‘configure'

As explained in the devel documentation (J.2.6) the docs could be made to build by adding ‘export DOCBOOKSTYLE=/opt/local/share/dsssl/docbook-dsssl'

However, in J.2.4 it implies that just using MacPorts will work without additional setup. This patch makes that happen.

diff --git a/config/docbook.m4 b/config/docbook.m4
index 4304fa7..f88889d 100644
--- a/config/docbook.m4
+++ b/config/docbook.m4
@@ -55,7 +55,7 @@ AC_CACHE_VAL([pgac_cv_path_stylesheets],
[if test -n "$DOCBOOKSTYLE"; then
pgac_cv_path_stylesheets=$DOCBOOKSTYLE
else
- for pgac_prefix in /usr /usr/local /opt /sw; do
+ for pgac_prefix in /usr /usr/local /opt /opt/local /sw; do
for pgac_infix in share lib; do
for pgac_postfix in \
sgml/stylesheets/nwalsh-modular \
@@ -65,7 +65,8 @@ else
sgml/docbook/dsssl/modular \
sgml/docbook/stylesheet/dsssl/modular \
sgml/docbook/dsssl-stylesheets \
- sgml/dsssl/docbook-dsssl-nwalsh
+ sgml/dsssl/docbook-dsssl-nwalsh \
+ dsssl/docbook-dsssl
do
pgac_candidate=$pgac_prefix/$pgac_infix/$pgac_postfix
if test -r "$pgac_candidate/html/docbook.dsl" \