[pitivi] Allow disable help

[Thibault Saunier <tsaunier src gnome org>]

commit f0673c8602d74efdaad641ba3eaa6ffd3297ab29
Author: Thibault Saunier <thibault saunier collabora com>
Date:   Mon Dec 2 11:58:33 2013 -0300

    Allow disable help

 Makefile.am  |    6 +++++-
 autogen.sh   |   15 +++++++++++----
 configure.ac |   16 +++++++++++++++-
 3 files changed, 31 insertions(+), 6 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index 7a1edec..f536cb3 100755
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,6 +1,10 @@
 AUTOMAKE_OPTIONS = dist-bzip2
 
-SUBDIRS        = bin pitivi common po tests data help
+SUBDIRS        = bin pitivi common po tests data
+
+if BUILD_HELP
+SUBDIRS += help
+endif
 
 mimedir = $(datadir)/mime/packages
 mime_DATA = pitivi.xml
diff --git a/autogen.sh b/autogen.sh
index 048a2ec..8ab638f 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -62,10 +62,17 @@ fi
 
 toplevel_check $srcfile
 
-GNOMEDOC=`which yelp-build`
-if test -z $GNOMEDOC; then
-  echo "Please intall the yelp-tools package"
-  exit 1
+build_help=true
+while getopts disable-help x; do
+  build_help=false
+done; OPTIND=0
+
+if $build_help; then
+  GNOMEDOC=`which yelp-build`
+  if test -z $GNOMEDOC; then
+    echo "Please intall the yelp-tools package"
+    exit 1
+  fi
 fi
 
 # This is needed to create ltmain.sh for our C bits.
diff --git a/configure.ac b/configure.ac
index 1faa153..00a8c72 100644
--- a/configure.ac
+++ b/configure.ac
@@ -67,7 +67,21 @@ AC_CONFIG_FILES([bin/pitivi], [chmod +x bin/pitivi])
 PKG_CHECK_MODULES([cairo], [cairo])
 PKG_CHECK_MODULES([pycairo], [pycairo])
 
-YELP_HELP_INIT
+AC_ARG_ENABLE(help,
+  AS_HELP_STRING([--disable-help],[disable help]),
+  [
+    case "${enableval}" in
+      yes) BUILD_HELP=yes ;;
+      no)  BUILD_HELP=no ;;
+      *)   AC_MSG_ERROR(bad value ${enableval} for --disable-help) ;;
+    esac
+  ],
+[BUILD_HELP=yes]) dnl Default value
+AM_CONDITIONAL(BUILD_HELP, test "x$BUILD_HELP" = "xyes")
+
+if test x$BUILD_HELP = xyes; then
+  YELP_HELP_INIT
+fi
 
 dnl output stuff
 AC_OUTPUT(