"f" => "sc" gives diff error

[Jon Noack]

Setting "f" => "sc" results in this error when attempting to view a 
preferred diff:
/usr/bin/diff: conflicting specifications of output style

Immediately following the error the diff is printed, but it is in 
context form with no colorization (enscript is probably trying to 
colorize for side-by-side and as a result doesn't colorize anything).

Is it possible we're trying to run the diff with both "-c" and 
"--side-by-side"?  Using "uc" or "cc" instead of "sc" produces the 
expected output.

Vitals:
FreeBSD 5.2.1-RC2
Perl 5.6.1 (FreeBSD port)
CVSweb 2.9.3
diff - GNU diffutils version 2.7 (FreeBSD base system)
GNU enscript 1.6.4

A search of the archives didn't reveal anything, so I think this may be 
a new issue.

Thanks,
Jon Noack