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  What causes a "MEMORY OVERBOOKED" error during compilation?:

  Memory overbooked errors are caused by an overflow of the static area
  reserved to store pending pre-processor directives.  It's a common
  problem when using multiple header files.  If you are not overriding
  optimization with the NO OPTIMIZE keyword, you can make more memory
  available to the pre-processor by simply deleteing all command
  translations in the header files MACHSIX.CH, MACHSIX2.CH between the
  comment lines beginning with 'SPECIFY "NO OPTIMIZE"...' to the comment
  line "MACHSIX OPTIMIZED COMMANDS".  In many cases this will free enough
  space for a clean compile.