SVK is built on top of Subversion, so it is not "pure" Perl.
msysgit is the development environment of Git for Windows, that hardly warrants a "versioning done in pure Perl" tag.
A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James
My blog: Imperial Deltronics