Jan says:

  Now that is interesting, because according to my manual pages,
  'int setpgrp(void)' is originally from 4.2BSD. I wonder if I should just
  change to using the equivalent, but POSIX defined setpgid(0,0).

From the NetBSD man page:


  STANDARDS
       The setpgid() function conforms to ISO/IEC 9945-1:1990 (``POSIX.1'').

  COMPATIBILITY
       setpgrp() is identical to setpgid(), and is retained for calling conven-
       tion compatibility with historical versions of BSD.


In general, I'd say write to posix and let people with non-posix
systems submit workarounds.

I suspect setpgrp was 1 arg in 4.2 and changed to 2 by 4.4.