[dconf] build: Add --disable-man

[Ryan Lortie <ryanl src gnome org>]

commit 390126b07492faa53c36b42bff4cd0d92b5f5e52
Author: Colin Walters <walters verbum org>
Date:   Tue Aug 7 10:58:23 2012 -0400

    build: Add --disable-man
    
    1) For embedded systems, it makes no sense to include documentation
       of this kind on each image.  So we might as well not even build
       it.
    2) For people bootstrapping systems from source code, documentation
       is the source of many cyclical build loops.  Allowing it to
       be disabled helps cut these loops.
    3) The Docbook stylesheets are distributed as Zip files, and
       the gnome-ostree builder only consumes git repositories.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=681385

 configure.ac     |   13 ++++++++++++-
 docs/Makefile.am |    6 +++++-
 2 files changed, 17 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index c411c27..1932485 100644
--- a/configure.ac
+++ b/configure.ac
@@ -20,7 +20,18 @@ fi
 AC_PROG_CC
 AM_PROG_VALAC([0.17.0])
 AC_PROG_RANLIB
-AC_PATH_PROG([XSLTPROC], [xsltproc])
+AC_ARG_ENABLE(man,
+              [AS_HELP_STRING([--enable-man],
+                              [generate man pages [default=yes]])],,
+              enable_man=yes)
+
+AS_IF([test "$enable_man" != no], [
+  AC_PATH_PROG([XSLTPROC], [xsltproc])
+  AS_IF([test -z "$XSLTPROC"], [
+    AC_MSG_ERROR([xsltproc is required for --enable-man])
+  ])
+])
+AM_CONDITIONAL(ENABLE_MAN, test "$enable_man" != no)
 
 # Use GSettings
 GLIB_GSETTINGS
diff --git a/docs/Makefile.am b/docs/Makefile.am
index d4f9ec7..e5d2871 100644
--- a/docs/Makefile.am
+++ b/docs/Makefile.am
@@ -32,11 +32,15 @@ dconf.1: dconf-tool.xml
 dconf.7: dconf-overview.xml
 	$(AM_V_GEN) $(XSLTPROC) $(XSLTPROC_MAN_FLAGS) http://docbook.sourceforge.net/release/xsl/current/manpages/docbook.xsl $<
 
-man_MANS = \
+man_MANS =
+
+if ENABLE_MAN
+man_MANS += \
         dconf-service.1 \
 	dconf-editor.1 \
 	dconf.1 \
 	dconf.7
+endif
 
 EXTRA_DIST += dconf-service.xml dconf-editor.xml dconf-tool.xml dconf-overview.xml