Order by clause causing core dumps

I have a report written in Informix-4GL that contains an ORDER BY in the report section. The program compiles runs fine under RDS, but the exact same program results in c4gl: Memory fault - core dumped when using the c-compiler. There is nothing special about the ORDER BY. I have tried changing the order by to the member of a record, a standalone integer, with the same result. OS is SCO Unix 3.2.4.2 4GL RDS is 4.11.UC4 4GL C4GL is 4.11.UC1 ONLINE is 5.01.UD2 Help from anyone will be most appreciated. Thanks Bob Pellegrin Financial Mgt Systems