If you use a Revision (or Version) Control System (RCS/VCS) for
      your projects then PBMake can be made aware of the 'checked in'
      location of your source files, libraries and include files.

      To set up PBMake to be aware of your revision control system, the
      command required to check-out a file, and the command required to
      clean up the temporarily checked out file must be added to your
      PBMake .MAK script.

      PBMake has been tested with dosRCS, the free revision control
      system which is managed by the GNU project team. If you've not yet
      seen dosRCS or you are not currently using an RCS system to manage
      your source code, then point yourself to :-

      ftp://ftp.leo.org/pub/comp/os/os2/gnu/devtools/rcs57pc1.zip
      ftp://ftp.leo.org/pub/comp/os/os2/gnu/devtools/rcs57pc2.zip