Hello. I hope this is the right place to submit questions. I consistently get compile errors, even with the simplest C++ program, on AIX. The error states, 'sigset64_t' is used as a type, but is not defined as a type. It seems to me that the compiler is trying to compile in 64-bit mode. Our AIX installation is running in 32 bit mode. I have Googled this and found alot of people with the same error but no solutions. Thanks for any help. Andrew Pierce Systems Consultant II UnumProvident apierce@xxxxxxxxxxxxxxxxx 423.294.4318