[krbdev.mit.edu #8672] KFW 4.1 credential cache issue

[Greg Hudson via RT]

If you set the environment variable KRB5_TRACE to a filename, trace 
logging information will be written to that file.

I expect to push some patches to the master branch some time this week 
which should fix the Perl problem you ran into, and most likely the 
linker error (assuming it was when linking Leash), among other issues.