On Mon, Jan 18, 2010 at 6:35 PM, Reinhard Kotucha <reinhard.kotucha@web.de> wrote:
If I can evaluate, for instance, luatex.datestamp, I can enable MD5
checks in my script on sytems where it works.  That would be nice.

How about

if (md5.sumhexa("abcdefghijklmnopqrstuvwxyz") == "c3fcd3d76192e4007dfb496cca67e13b") then
  -- md5 works... do what you want
   -- fallback for md5 not working

This way, you also protect yourself from bugs in the future versions of luatex :-)