From e8e2626f06f068ee523489b2c37d9fe2c65fb3c0 Mon Sep 17 00:00:00 2001
From: Glenn Morris <rgm@gnu.org>
Date: Mon, 5 May 2014 13:22:32 -0400
Subject: [PATCH] * autogen.sh: Check any pre-existing ACLOCAL_PATH.

---
 ChangeLog  |  4 ++++
 autogen.sh | 57 +++++++++++++++++++++++++++++++++++-------------------
 2 files changed, 41 insertions(+), 20 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index d9837bc3c12..a58fbc9ae37 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2014-05-05  Glenn Morris  <rgm@gnu.org>
+
+	* autogen.sh: Check any pre-existing ACLOCAL_PATH.
+
 2014-05-04  Paul Eggert  <eggert@cs.ucla.edu>
 
 	Consult libpng-config more consistently (Bug#17339).
diff --git a/autogen.sh b/autogen.sh
index d04893316a4..35175e70b1c 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -212,27 +212,44 @@ echo "Checking for pkg.m4..."
 AUTORECONF_ENV=
 env_space=
 ac_dir=`aclocal --print-ac-dir` && test -r "$ac_dir/pkg.m4" || {
-  oIFS=$IFS
-  IFS=:
-  before_first_aclocal=true
-  for dir in $PATH; do
-    if test -x "$dir/aclocal"; then
-      if $before_first_aclocal; then
-	before_first_aclocal=false
-      elif ac_dir=`"$dir/aclocal" --print-ac-dir` && test -r "$ac_dir/pkg.m4"
-      then
-	case $ACLOCAL_PATH in
-	  '') ACLOCAL_PATH=$ac_dir;;
-	  ?*) ACLOCAL_PATH=$ACLOCAL_PATH:$ac_dir;;
-	esac
-	export ACLOCAL_PATH
-	AUTORECONF_ENV="ACLOCAL_PATH='$ACLOCAL_PATH'"
-	env_space=' '
-	break
+
+  # Maybe ACLOCAL_PATH is already set-up.
+  if test -n "$ACLOCAL_PATH"; then
+    oIFS=$IFS
+    IFS=:
+    for dir in $ACLOCAL_PATH; do
+      if test -r "$dir/pkg.m4"; then
+  	AUTORECONF_ENV="ACLOCAL_PATH='$ACLOCAL_PATH'"
+        env_space=' '
+  	break
       fi
-    fi
-  done
-  IFS=$oIFS
+    done
+    IFS=$oIFS
+  fi
+
+  if test -z "$AUTORECONF_ENV"; then
+    oIFS=$IFS
+    IFS=:
+    before_first_aclocal=true
+    for dir in $PATH; do
+      if test -x "$dir/aclocal"; then
+        if $before_first_aclocal; then
+          before_first_aclocal=false
+        elif ac_dir=`"$dir/aclocal" --print-ac-dir` && test -r "$ac_dir/pkg.m4"
+        then
+          case $ACLOCAL_PATH in
+            '') ACLOCAL_PATH=$ac_dir;;
+            ?*) ACLOCAL_PATH=$ACLOCAL_PATH:$ac_dir;;
+          esac
+          export ACLOCAL_PATH
+          AUTORECONF_ENV="ACLOCAL_PATH='$ACLOCAL_PATH'"
+          env_space=' '
+          break
+        fi
+      fi
+    done
+    IFS=$oIFS
+  fi
 
   ## OK, maybe pkg-config is in a weird place (eg on hydra).
   if test -z "$AUTORECONF_ENV"; then