Phil converted all non Clipper functions used in PBMake to either
  Nanforum library calls or pure Clipper source code. (mostly CT3)

  Brian Dukes has taken the 2.02 source code and added code which
  provides Version Control awareness. As far as we know, this places
  PBMake in a very small class of make engines, and the other ones are
  reputed to be cranky or very difficult to use. Brian, in adding RCS
  support, which is a GNU freeware Revision Control System, has added a
  powerful new edge to an already excellent make engine.

  RCS checking is implemented on all levels.

  SOURCE, INCLUDE and LIBRARY files are checked!

  Thank you Brian!