+
+# Apparently the "old way" to get S_ISLNK and friends is to do this:
+#
+use POSIX ':fcntl_h';
+
+# But apparently the "new way" is to do this:
+#
+# use Fcntl ':mode';
+#
+# but of course that will generate an error on "old" (pre-5.6?) Perl versions.
+# So we do it like this instead:
+#
+BEGIN {
+ if (! defined(&S_ISLNK)) { # perhaps defined by "POSIX"?
+ require Fcntl;
+ import Fcntl ':mode'; # if not, look for it in "Fcntl".
+ }
+}
+