Can I view the RCS log with diffs?
rcshist (written by Ian Dowse) does what was requested. I do not know of prebuilt packages, but it builds easily. Here is sample output: REV:1.346 aclocal.m4 2012/09/03 17:21:43 tom tags: xterm-281s, xterm-281r, xterm-281q, xterm-281p, xterm-281o, xterm-281n, xterm-281m, xterm-281l, xterm-281k, xterm-281j, xterm-281i, xterm-281h, xterm-281g, xterm-281f, xterm-281e change default for --with-xpm ---...