From 630c3cf83f9ad785770da3accb32094c85559a7d Mon Sep 17 00:00:00 2001
From: Enrico Forestieri <forenr@lyx.org>
Date: Wed, 26 Sep 2007 22:50:00 +0000
Subject: [PATCH] Make sure that an empty po/POTFILES.in file exists at
 configure time, otherwise no Makefile is generated in the po dir and
 compilation fails. Once the empty file served the purpose, remove it in order
 to immediately trigger its regeneration, which would only happen after
 updating one of the Makefile.am files.

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@20527 a592a061-630c-0410-9148-cb99ea01b6c8
---
 configure.ac | 3 +++
 m4/po.m4     | 7 +++++++
 2 files changed, 10 insertions(+)

diff --git a/configure.ac b/configure.ac
index bb539e2155..e010c8175d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -33,6 +33,9 @@ for file in config/install-sh config/mkinstalldirs ; do
   chmod 755 ${srcdir}/${file}
 done
 
+### Provide a dummy POTFILES.in in po in order to mark it as a PO directory
+test -f ${srcdir}/po/POTFILES.in || touch ${srcdir}/po/POTFILES.in
+
 ### Check for programs
 AC_PROG_MAKE_SET
 AC_PROG_INSTALL
diff --git a/m4/po.m4 b/m4/po.m4
index f2795eea0c..1a5353681e 100644
--- a/m4/po.m4
+++ b/m4/po.m4
@@ -114,6 +114,13 @@ AC_DEFUN([AM_PO_SUBDIRS],
           test -n "$as_me" && echo "$as_me: creating $ac_dir/POTFILES" || echo "creating $ac_dir/POTFILES"
           cat "$ac_given_srcdir/$ac_dir/POTFILES.in" | sed -e "/^#/d" -e "/^[ 	]*\$/d" -e "s,.*,     $top_srcdir/& \\\\," | sed -e "\$s/\(.*\) \\\\/\1/" > "$ac_dir/POTFILES"
           POMAKEFILEDEPS="POTFILES.in"
+          # Remove POTFILES.in if it is empty, such that it can be
+          # correctly rebuilt later.
+          if test -s "$ac_given_srcdir/$ac_dir/POTFILES.in"; then
+            : ;
+          else
+            rm -f "$ac_given_srcdir/$ac_dir/POTFILES.in"  
+          fi
           # ALL_LINGUAS, POFILES, UPDATEPOFILES, DUMMYPOFILES, GMOFILES depend
           # on $ac_dir but don't depend on user-specified configuration
           # parameters.