http://cvs.pld-linux.org/cgi-bin/cvsweb.cgi/SOURCES/Attic/autoconf-sh.patch?rev=1.1;content-type=text%2Fplain

Index: tests/wrapper.in
===================================================================
RCS file: /cvsroot/autoconf/autoconf/tests/wrapper.in,v
retrieving revision 1.4
diff -u -u -r1.4 wrapper.in
--- autoconf-2.59/tests/wrapper.in 25 Sep 2003 09:30:35 -0000 1.4
+++ autoconf-2.59/tests/wrapper.in 19 Nov 2003 13:17:11 -0000
@@ -13,9 +13,10 @@
 elif test -n "${BASH_VERSION+set}" && (set -o posix) >/dev/null 2>&1; then
   set -o posix
 fi
+DUALCASE=1; export DUALCASE # for MKS sh
 
 # Support unset when possible.
-if ((MAIL=60; unset MAIL) || exit) >/dev/null 2>&1; then
+if ( (MAIL=60; unset MAIL) || exit) >/dev/null 2>&1; then
   as_unset=unset
 else
   as_unset=false