SCO "runbig" strangeness

[The Super User]

Hi world. I just tried to use the "runbig" command to execute a
very large editor I just built, because just executing the program
gets a "not enough core" error. The executable is 330K or so, and
my machine has a maximum process size of 1400K. But "runbig" says
that the executable for the editor isn't found, even though just
typing the name of the program will attempt to execute it, and
"runbig emacs" will find /usr/local/bin/emacs (micro emacs) and
run it...
Is there some given bogosity in "runbig" on SCO Xenix 2.2.1 ?
Any help would be appreciated.
Thanks
-Jay (Jay.Libove at andrew.cmu.edu  or  pitt!darth!libove!libove)