From 258ff7f5eef3a0813f04c4c78f28f50fb601bef7 Mon Sep 17 00:00:00 2001
From: Darren Salt <linux@youmustbejoking.demon.co.uk>
Date: Wed, 2 Dec 2009 18:37:05 +0000
Subject: Optimisation of generated documentation PNGs.

---
 configure.ac                 | 7 +++++++
 doc/hackersguide/Makefile.am | 3 +++
 2 files changed, 10 insertions(+)

diff --git a/configure.ac b/configure.ac
index ecdbb2b1b..181fd8dd5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1190,6 +1190,13 @@ AM_CONDITIONAL([HAVE_XMLTO], [test "$XMLTO" != "no"])
 AC_CHECK_PROG(RSVG, rsvg, rsvg, no)
 AM_CONDITIONAL([HAVE_RSVG], [test "$RSVG" != "no"])
 
+dnl ---------------------------------------------
+dnl ... and for PNG optimisation tool
+dnl ---------------------------------------------
+
+AC_CHECK_PROG(OPTIPNG, optipng, optipng, no)
+AM_CONDITIONAL([HAVE_OPTIPNG], [test "$OPTIPNG" != "no"])
+
 dnl ---------------------------------------------
 dnl Output configuration files
 dnl ---------------------------------------------
diff --git a/doc/hackersguide/Makefile.am b/doc/hackersguide/Makefile.am
index 2b65bfe90..37269eaf0 100644
--- a/doc/hackersguide/Makefile.am
+++ b/doc/hackersguide/Makefile.am
@@ -56,6 +56,9 @@ endif
 if HAVE_RSVG
 .svg.png:
 	rsvg -f png $^ $@
+if HAVE_OPTIPNG
+	optipng $@
+endif
 else
 .svg.png:
 	if test x"$(fail_if_missing)" = x"yes"; then \
-- 
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