Thanks. I installed that patch (actually, the following slightly different patch): Index: m4sh.m4 =================================================================== RCS file: /cvsroot/autoconf/autoconf/lib/m4sugar/m4sh.m4,v retrieving revision 1.113 retrieving revision 1.115 diff -p -u -r1.113 -r1.115 --- m4sh.m4 30 Jan 2004 14:29:19 -0000 1.113 +++ m4sh.m4 3 May 2004 03:49:22 -0000 1.115 @@ -215,7 +215,7 @@ if test "x$CONFIG_SHELL" = x; then AS_IF([test $as_have_required = yes && dnl _AS_RUN([_AS_DETECT_SUGGESTED_BODY]) 2> /dev/null], [], - [as_candidate_shells="$SHELL" + [as_candidate_shells= _AS_PATH_WALK([/bin$PATH_SEPARATOR/usr/bin$PATH_SEPARATOR$PATH], [case $as_dir in /*) @@ -224,7 +224,7 @@ if test "x$CONFIG_SHELL" = x; then done esac]) - for as_shell in $as_candidate_shells; do + for as_shell in $as_candidate_shells $SHELL; do AS_IF([_AS_RUN([_AS_DETECT_REQUIRED_BODY], [$as_shell 2> /dev/null])], [CONFIG_SHELL=$as_shell as_have_required=yes