Hello, This Autoconf patch refines the way Autoconf chooses a usable shell, and should help to avoid incompatibilites in various packages, like the one which the Autoconf CVS code uncovered in Automake, as discussed in this thread: http://mail.gnu.org/archive/html/automake/2004-04/msg00095.html -- ES 2004-04-19 Eric Sunshine <sunshine@xxxxxxxxxxxxxx> * lib/m4sugar/m4sh.m4 (_AS_DETECT_BETTER_SHELL): Consult $SHELL as a possible candidate only after all others fail, rather than consulting it first. This improves backward compatibility by better reflecting the way shell selection occurred in previous versions of Autoconf, and should help to avoid triggering latent problems in other packages, such as the one in Automake where zsh is not handled robustly: http://mail.gnu.org/archive/html/automake/2004-04/msg00095.html Although it is not Autoconf's responsibility to work around problems in Automake, it nevertheless makes sense to avoid introducing unnecessary incompatibilites. --- m4sh.m4-orig Mon Apr 19 02:48:42 2004 +++ m4sh.m4 Mon Apr 19 02:49:05 2004 @@ -215,7 +215,7 @@ 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 $as_dir in /*) @@ -223,6 +223,7 @@ as_candidate_shells="$as_candidate_shells $as_dir/$as_base" done esac]) + as_candidate_shells="$as_candidate_shells $SHELL" for as_shell in $as_candidate_shells; do AS_IF([_AS_RUN([_AS_DETECT_REQUIRED_BODY], [$as_shell 2> /dev/null])],
