Read-only support is provided for files produced by the BitKeeper suite. Flags and information which are specific to BitKeeper is ignored by cssc. At the moment, it is not possible to turn off support for BitKeeper files, but a warning message is issued when one is encountered.
Actions on BitKeeper files that cssc will not perform include
cssc does not prevent the use of unget on BitKeeper files,
because unget does not examine the sccs file header (and
therefore has no way to determine if the file is a BitKeeper file or
not).