The example user routine image can be constructed by running:

  $ @PCA$EXAMPLES:DEMO_USER_ROUTINE.COM

    If you are using the VAX C rather than DEC C compiler replace the
    line:

        SYS$LIBRARY:DECCRTL.OLB/LIBRARY
                    ^^^

    from VAX_DEMO_USER_ROUTINE.OPT with:

        SYS$LIBRARY:VAXCRTL.OLB/LIBRARY
                    ^^^