Recovers space that was occupied by modules deleted from the
    library. When you specify /COMPRESS, LIBRARY creates a new
    library. You can use options to the /COMPRESS qualifier to make
    some specifications in the new version of the library different
    from the original library.

    Format

      /COMPRESS[=(option[,...])]

 option

    An option that alters the size or format of the library,
    overriding the values specified when the library was created.
    You can specify one or more of the following options: BLOCKS:n,
    GLOBALS:n, HISTORY:n, KEEP, KEYSIZE:n, MODULES:n, or VERSION:n.