formbuild error

I am a new Unix/Informix user by default. We lost out Unix Support person and will not be replaced. So I have inherited a legacy system to try to support. I am using a very old version of Informix early 80's version 3.3. We also have a very old, really old Altos system. The problem is on the Sco-Unix system when I use formbuild to build a form, if the form links 2 tables, it will not build the form successfully. It will only complete a successful formbuild if the form is built from one table. The same version is on the old Altos system and it works ok. I have learned that formbuild has never worked on the Unix box. In the past, they would build the forms on the Altos box and copy them to the Unix box. Well the Altos box is on it's last leg I think. I do not want to continue to work around the systems. Does anyone have a thought on this? I would appreciate any input. Thanks Irma Kyle ikyle@aol.com