Either have "python3" on your $PATH and put src somewhere on your $PATH, or call a Python interpreter explicity to run SRC. Python 2.7 or any Python 3.x interpreter for x >= 3 will work.
Have RCS or SCCS or both installed on your system.
The RCS this was written against is GNU 5.9.4 under Linux. OS X 5.9.4 has slightly different behavior but works. Amazon Linux running 5.7 also gives good results.
The GNU version of SCCS, CSSC or "Compatibly Stupid Source Control", will do; the SunOS and Schilling versions remove some minor limitations.
Installing the documentation requires asciidoctor.
If you want to use the "visualize" command, you will need to install the graphviz package to get dot(1).
There’s a 'make install' production you can use that also installs the manual page. It will require root permissions.
Doing 'make check' performs a comprehensive test of the software. You must have both RCS and SCCS installed for this to work. If you have rcs-fast-import installed, it must be at version 1.3 or later.
The FAQ has a section on how to report bugs.