You have two options:
- You can order the A/UX Development Toolkit from APDA. This
contains C89, which is an ANSI standard C compiler for A/UX. You could
then use this to compile your source for GCC.
- You can obtain the A/UX GCC binary from any of the following
Internet addresses: wuarchive.wustl.edu, afsg.Apple.com,
aux.support.Apple.com.