Hmmm. It had to do with tcl/tk on FreeBSD. The configure scripts are

Hmmm.  It had to do with tcl/tk on FreeBSD.  The configure scripts are
in
different directories.  The patch gave the option of specifying a dir
for
the tk script and if they were both in the same directory then it didn't
mind being empty.  It's small so I'm including it.  It was tested with
autoconf 2.12.

Vince.