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     Error U1509
 
     out of heap space
 
     PWBRMAKE ran out of memory.
 
     One of the following may be a solution:
 
        ■ Reduce the memory that PWBRMAKE will require by using one or
          more options. Use /Ei or /Es to eliminate some input files.
          Use /Em to eliminate macro bodies.
 
        ■ Free some memory by removing terminate-and-stay-resident
          (TSR) software.
 
        ■ Reconfigure the EMM driver.
 
        ■ Change CONFIG.SYS to specify a lower number of buffers (the
          BUFFERS command) and fewer drives (the LASTDRIVE command).
                                    -♦-