From dd0b8142683d35bdb7e04cc15ece43039ede2a41 Mon Sep 17 00:00:00 2001
From: Mathieu Lirzin <mthl@gnu.org>
Date: Tue, 29 Aug 2017 14:16:24 +0200
Subject: config: Support AUTOMAKE_LIBDIR environment variable

* lib/Automake/Config.in: Let AUTOMAKE_LIBDIR environment variable
override the default location for '$libdir'.
* doc/automake.texi (automake Invocation): Document AUTOMAKE_LIBDIR.
* pre-inst-env.in (AUTOMAKE_LIBDIR): Set AUTOMAKE_LIBDIR.
* bin/wrap-automake.in: Don't use "--libdir" option.
---
 bin/wrap-automake.in   | 5 -----
 doc/automake.texi      | 5 +++++
 lib/Automake/Config.in | 2 +-
 pre-inst-env.in        | 3 +++
 4 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/bin/wrap-automake.in b/bin/wrap-automake.in
index a363dbc7c..09b1b30f8 100644
--- a/bin/wrap-automake.in
+++ b/bin/wrap-automake.in
@@ -16,9 +16,4 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-BEGIN
-{
-  use strict;
-  unshift @ARGV, '--libdir=@abs_top_srcdir@/lib';
-}
 require '@abs_top_builddir@/bin/automake';
diff --git a/doc/automake.texi b/doc/automake.texi
index 544f7c1e4..1f0b7e581 100644
--- a/doc/automake.texi
+++ b/doc/automake.texi
@@ -2579,6 +2579,11 @@ for more information.
 Look for Automake data files in directory @var{dir} instead of in the
 installation directory.  This is typically used for debugging.
 
+@vindex AUTOMAKE_LIBDIR
+The environment variable @env{AUTOMAKE_LIBDIR} provides another way to
+set the directory containing Automake data files.  However
+@option{--libdir} takes precedence over it.
+
 @item --print-libdir
 @opindex --print-libdir
 Print the path of the installation directory containing Automake-provided
diff --git a/lib/Automake/Config.in b/lib/Automake/Config.in
index 9437eca9d..a22fdc0f7 100644
--- a/lib/Automake/Config.in
+++ b/lib/Automake/Config.in
@@ -32,7 +32,7 @@ our $PACKAGE = '@PACKAGE@';
 our $PACKAGE_BUGREPORT = '@PACKAGE_BUGREPORT@';
 our $VERSION = '@VERSION@';
 our $RELEASE_YEAR = '@RELEASE_YEAR@';
-our $libdir = '@datadir@/@PACKAGE@-@APIVERSION@';
+our $libdir = $ENV{"AUTOMAKE_LIBDIR"} || '@datadir@/@PACKAGE@-@APIVERSION@';
 
 our $perl_threads = 0;
 # We need at least this version for CLONE support.
diff --git a/pre-inst-env.in b/pre-inst-env.in
index 1599c7b5d..880012cce 100644
--- a/pre-inst-env.in
+++ b/pre-inst-env.in
@@ -29,4 +29,7 @@ export PATH
 AUTOMAKE_UNINSTALLED=1
 export AUTOMAKE_UNINSTALLED
 
+AUTOMAKE_LIBDIR="$abs_top_srcdir/lib"
+export AUTOMAKE_LIBDIR
+
 exec "$@"
-- 
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