Suppressing c2 "Optimizations"

[Chuck Smoko - E41]

Has anyone been able copy SUNOS 1/4" distribution tapes using the public
domain copytape program?  The SUNOS tcopy(1) does not lend itself to my
situation because I have only one drive per machine.  When I compile and
run copytape using SUNOS 4, it does not go past the first file on the
tape.   Using SUNOS 3.5, I run copytape regularly on all 1/2" tapes and on
SUNOS 3.5 1/4" distribution tapes.  I guess  SUNOS 4 1/4" tapes have a
strange blocking factor that may be greater than 126.  My question is:
Does anyone have a copytape that has been modified to run under SUNOS 4?
I got the one that I am using a while ago on simtel20.  Pointers on how to
copy the SUNOS 4 1/4" tapes using a 3.5 system are also welcome.  If I get
enough responses, I will summarize.

                                        Chuck Smoko
                                        csmoko at relay.nswc.navy.mil
                                        Naval Surface Warfare Ctr.

ps: I have read the sun-spots archives on copying SUNOS tapes. I,
however, did not notice any articles that discuss a particular
method in detail.