Warning: Unrecognized control line from AIX

I am printing from IBM's AIX (Unix System V) to RPM Remote Print Manager®, and the following appears in the RPM log:

Warning: Unrecognized control line: -N1
Warning: Unrecognized control line: -Zmblack@host2
Warning: Unrecognized control line: -tmblack@host2
Warning: Unrecognized control line: -TSTDIN.34509

Furthermore, if I specify the number of copies, RPM ignores it.

The format of the control lines sent by LPR is documented in RFC 1179. IBM, SCO, and other vendors have chosen to add their own "extended" options. RPM understands the standard BSD control lines.

New versions of RPM should properly handle the "number of copies" feature. These extended options are not documented thoroughly like the RFC 1179 specification.

RPM will ignore all control lines that it does not recognize. You will see simple information messages in the log because they are not detrimental to the way RPM processes the rest of the data. They are simply ignored.