configure: make perl path with whitespace a warning, not error.

For https://bugs.gnu.org/74453.
See also https://bugs.gnu.org/62896.

* configure.ac (PERL): use AC_MSG_WARN.

diff --git a/configure.ac b/configure.ac
index e4c7a126c06f40a34a2cb99db9672d1bbca09aea..fb2b3707624acb224453181b4adc8ba3bf24f167 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -73,9 +73,11 @@ case $PERL in
    AC_MSG_ERROR([perl not found])
    ;;
  *' '* | *'    '*)
-  AC_MSG_ERROR([The path to your Perl contains spaces or tabs.
-This would cause build failures later or unusable programs.
-Please use a path without spaces and try again.])
+  AC_MSG_WARN([The path to your Perl contains spaces or tabs.
+This will likely cause build failures later or unusable programs.
+Unless you're specifying a full string for a #! line,
+as in "/usr/bin/env perl",
+please use a path without spaces and try again.])
   ;;
 esac