Specifies where to look for %INCLUDE files,  environment  files,
  or   text   libraries.    The   compiler  applies  the  /INCLUDE
  information to the following Pascal constructs:

       %INCLUDE 'name' or %INCLUDE 'name.ext'

       [inherit('name')] or [inherit('name.ext')]

       %INCLUDE 'name(modname)'

  Directories are searched in the following order:

  1.  The current directory

  2.  The directories specified by /INCLUDE (if any) in the  order
      in which they were specified

  3.  SYS$LIBRARY: