General build process

• Always ensure your tools are set up for 64-bit output. OBJECT_MODE=64 will instruct IBM utilities (or pass the dedicated options) and use -maix64 for GCC, set for both CPPFLAGS and LDFLAGS.

• If you're using Perzl or Bull packages, exclude /opt/freeware/bin from your path, as to avoid making their packages visible. If you do want to use tools, say, GCC, git, or Perl, then you can use an absolute path to them or put symlinks to them on your path.