/OPTION_FILE[=file-spec]
       /NOOPTION_FILE (default)

    CLBUILD can optionally produce a command option file that
    contains correct table sizes to hold the command definitions
    which were just compiled (plus a little room for growth). The
    /OPTION_FILE qualifier causes this file to be read as input and
    a new such option file created as output. If /OPTION_FILE is
    specified with no value, then the file written will have the
    same name as the input command definition file, but with the file
    extension .COP; for instance, if the file PMDF_COM:PMDF.CLD was
    the input parameter, then the default name for the output command
    option file would be PMDF_COM:PMDF.COP. If the /NOOPTION_FILE
    qualifier is specified (the default), then no option file will be
    output.

    Note that use of the /MAXIMUM qualifier causes CLBUILD to read
    options from MAXIMUM_COMMAND.DAT in addition to any command
    option file. This file specifies near maximum table sizes. Only
    use this qualifier if the current table sizes are inadequate,
    and only use it to create a new command option file. The /NOIMAGE
    qualifier should always be specified when /MAXIMUM is specified
    since a maximum-size image would be truly enormous and extremely
    wasteful.