Don't use _AS_PATH_WALK; it's not portable to Autoconf 2.52.

Clean up the code a bit.

diff --git a/m4/shell.m4 b/m4/shell.m4
index 9c2ce6e5be7b71c06a86eed98601cce2844389b6..7eb470761eb244bc6f06f3c56e0a5b152a41cecb 100644 (file)
--- a/m4/shell.m4
+++ b/m4/shell.m4
@@ -1,4 +1,4 @@
-#serial 3
+#serial 4
 
 # AC_PROG_SHELL
 # -------------
@@ -34,21 +34,24 @@ AC_DEFUN([AC_PROG_SHELL],
        # PATH.  Also, loop through PATH first and then through
        # shells, since less-"nice" shells in /bin and /usr/bin are
        # more likely to be installed than "nicer" shells elsewhere.
-        _AS_PATH_WALK([/bin:/usr/bin:$PATH],
-         [for ac_base in sh bash ksh sh5; do
-            case $as_dir in
-            /*)
-              rm -f conftest.c
-              if ("$as_dir/$ac_base" -c "$ac_command") 2>/dev/null; then
-                ac_cv_path_shell="$as_dir/$ac_base"
-                break
-              fi;;
-            esac
-          done
-          case $ac_cv_path_shell in
-          no) ;;
-          *) break;;
-          esac])
+       as_save_IFS=$IFS; IFS=:
+       for as_dir in /bin /usr/bin $PATH
+       do
+         IFS=$as_save_IFS
+         case $as_dir in
+         /*)
+           for ac_base in sh bash ksh sh5; do
+             rm -f conftest.c
+             if ("$as_dir/$ac_base" -c "$ac_command") 2>/dev/null; then
+               ac_cv_path_shell=$as_dir/$ac_base
+               break
+             fi
+           done
+           case $ac_cv_path_shell in
+           /*) break;;
+           esac;;
+         esac
+       done
        rm -f conftest.c;;
       esac])
    AC_MSG_RESULT($ac_cv_path_shell)