X-Git-Url: https://git.cworth.org/git?p=gzip;a=blobdiff_plain;f=m4%2Fshell.m4;h=abdd2ba4f6bb0c040ee236521647f510aa233fbc;hp=7eb470761eb244bc6f06f3c56e0a5b152a41cecb;hb=013796abf4c6be0bd130f541c0ece156156239c3;hpb=ce8afb6db89e58713e1758c1805abb5315b570ae

diff --git a/m4/shell.m4 b/m4/shell.m4
index 7eb4707..abdd2ba 100644
--- a/m4/shell.m4
+++ b/m4/shell.m4
@@ -1,4 +1,20 @@
-#serial 4
+# Check for a working shell.
+
+# Copyright (C) 2000, 2001, 2007 Free Software Foundation, Inc.
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+# 02111-1307, USA.
 
 # AC_PROG_SHELL
 # -------------
@@ -15,6 +31,8 @@ AC_DEFUN([AC_PROG_SHELL],
 	>conftest.c || exit
 	>|conftest.c || exit
 	!>conftest.c || exit
+	# Test that $(...) works.
+	test "$(expr 3 + 4)" -eq 7 || exit
       '
       ac_cv_path_shell=no