From d98360b945cd44701a925192f36d7ef681a92823 Mon Sep 17 00:00:00 2001
From: Dan Nicholson <dbn.lists@gmail.com>
Date: Mon, 28 Apr 2008 07:41:16 -0700
Subject: Only build man pages when docbook2man is available

Since not everyone has the whole DocBook chain, the building of the
man pages is now conditional on the docbook2man utility being available.
The built man pages are always included in `make dist', meaning that
docbook2man must be available in that situation.
---
 configure.ac    |  6 ++++++
 man/Makefile.am | 15 ++++++++++-----
 2 files changed, 16 insertions(+), 5 deletions(-)

diff --git a/configure.ac b/configure.ac
index 1246e8f..79ffdc7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -18,6 +18,12 @@ dnl - Debugging switches
 dnl ---------------------------------------------------------------------------
 CPPFLAGS="$CPPFLAGS -g"
 
+dnl ---------------------------------------------------------------------------
+dnl - Manual page build
+dnl ---------------------------------------------------------------------------
+AC_PATH_PROG(DOCBOOK2MAN, docbook2man, no)
+AM_CONDITIONAL(HAVE_DOCBOOK, [test "x$DOCBOOK2MAN" != xno])
+
 dnl ---------------------------------------------------------------------------
 dnl - Make paths available for source files
 dnl ---------------------------------------------------------------------------
diff --git a/man/Makefile.am b/man/Makefile.am
index 3ab7be6..376a714 100644
--- a/man/Makefile.am
+++ b/man/Makefile.am
@@ -1,20 +1,25 @@
-man_MANS =			\
+pm_mans =			\
 	on_ac_power.1		\
 	pm-pmu.1
 
+if HAVE_DOCBOOK
+man_MANS =			\
+	$(pm_mans)
+endif
+
 EXTRA_DIST =			\
 	on_ac_power.sgml	\
 	pm-pmu.sgml		\
-	$(man_MANS)
+	$(pm_mans)
 
 MAINTAINERCLEANFILES =		\
-	$(man_MANS)
+	$(pm_mans)
 
 pm-pmu.1: pm-pmu.sgml
-	docbook2man $?
+	$(DOCBOOK2MAN) $?
 
 on_ac_power.1: on_ac_power.sgml
-	docbook2man $?
+	$(DOCBOOK2MAN) $?
 
 clean-local :
 	rm -f *~
-- 
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