xmh gives 'errno = 2' for scan and msgchk

[Robert Cymbala <cymbala@lafn.org>]

Will xmh work without scan and msgchk?  As soon as xmh comes up,
two "notice" boxes appear:

  scan command returned:
  scan: (cannot execvp it)
  errno = 2; No such file or directory^G

  msgchk command returned:
  msgchk: (cannot execvp it)
  errno = 2; No such file or directory^G

This is on a mid-1990's Toshiba notebook. Got xmh as a result of
installing "X Window System (complete)" using tasksel.
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