It was all done at a personal level.
They trust people who have contributed.
They also realize that retirees way well be helpful on occasions. It is a two way process.
Also , I worked for a scientific research organization. I think they have a different outlook to businesses.
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In that case, maybe they would agree to release (parts of) this 30 years code, and avoid it disappears forever at some point when there are no more âcopies for personal useâ in the air ?
If not, I am afraid nobody can help about an unknown function call from an unknown source code 
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Agree.
I either work out how it compiled 15 years ago in FreeBSD or find something else to do. I have a complete source code copy. It must be an external function from some
obscure library that was present in FreeBSD but is not in my Devuan today.
I made a guess and looked at Xforms⌠it is not there.
I have to give up, and find a workaround.
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I have a workaround.
What this old software does is process images. The set_flag() function was only involved in driving X11 for image display. I set up an alternate method of image display using a call to xv. I had to modify xv to read the softwareâs internal image type, but that was easy. I now have a working setup
except
there are plotting functions that also use X11 . They do not work, but I can live with that.
Thank you to all for trying to help. It has been a long grind.
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