GNU CSSC is, mind you, a free replacement for SCCS.
Source Code Control System (SCCS) is the first version control system developed at Bell Labs in 1972 by Marc J. Rochkind for IBM System/370 computers running OS/MVT. Subsequently, a version was created for the PDP-11 running the UNIX operating system. Later, SCCS was included in several flavors of UNIX. The SCCS command set is currently part of the Single UNIX Specification.
SCCS was the most widely used version control system until the advent of RCS. Although SCCS should now be considered obsolete, the file format designed for SCCS is still used by some version control systems such as BitKeeper and TeamWare. The Sablime system also allows the use of SCCS files.[1] To store changes, SCCS uses the so-called. interleaved deltas technique. This technique is used by many modern version control systems as the basis for sophisticated merge techniques.
From the new: now you need a compiler that supports the C ++ 11 standard.
Download: ftp://ftp.gnu.org/gnu/cssc/CSSC-1.4.1.tar.gz
Source: linux.org.ru