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There is an autoconf test that tries to compile
| #include <unistd.h>
| int
| main ()
| {
| setpgrp(0,0);
| ;
| return 0;
| }
(with many additional defines - see config.log.gz). This file compiles
with the error message
conftest.c:185: error: too many arguments to function 'setpgrp'
hence configure concludes that SETPGRP_HAVE_ARG should *not* be defined
- yet you say it works when it is defined.
Can somebody with access to the system resolve this mystery? Studying
the header file that has the setpgrp declaration is probably necessary.