After install VP21

Find your VP21 root directory.
Here assume it is C:\VP21


(1) cd c:\vp21\source\RTL
(2) BLDRTL w32
    This will build the runtime library

(3) set correct path, for example:
    path=c:\vp21\bin.w32;%path%

Then,

  VP   -- invoke the VP2.1 IDE

  vpc  -- command line compiler
  makesure -I<include_Path> -L<Library_path> -R<resource_path> ...

or copy the vpo file in bin.w32 :
   copy c:\vp21\bin.w32\vp.vpo my.vpo
  Then edit the my.vpo  to customize your output directory
  Do not change anything that you do NOT understand it:-)

Then you can hava an easy way to use vpc:

   vpc -vmy.vpo your_pasfile.pas

Note that no space in "-v" and "my.vpo" !