Deprecate cacheout.pl with a warning

diff --git a/lib/cacheout.pl b/lib/cacheout.pl
index d2669a1..789c910 100644 (file)
--- a/lib/cacheout.pl
+++ b/lib/cacheout.pl
@@ -1,12 +1,18 @@
 #
 # This library is no longer being maintained, and is included for backward
 # compatibility with Perl 4 programs which may require it.
+# This legacy library is deprecated and will be removed in a future
+# release of perl.
 #
 # In particular, this should not be used as an example of modern Perl
 # programming techniques.
 #
 # Suggested alternative: FileCache
 
+warn( "The 'cacheout.pl' legacy library is deprecated and will be"
+      . " removed in the next major release of perl. Please use the"
+      . " FileCache module instead." );
+
 # Open in their package.
 
 sub cacheout'open {