How do I compile my BSD programs?

The file /usr/lpp/bos/bsdport contains information on how to port
programs written for BSD to AIX 3. This file may be very useful for
others as well.

A quick cc command for most "standard" BSD programs is:

$ cc -D_BSD -D_BSD_INCLUDES -o [loadfile] [sourcefile.c] -lbsd

If your software has system calls predefined with no prototype
parameters, also use the -D_NO_PROTO flag.