Ask HN: Bundling version control software with your final product

Hey guys, Does anyone have suggestions for a lightweight version of version control software that can be bundled into a product? This could be used by customers for versioning any configuration files they use to run the product. I was thinking more of an API from a library to link with, rather than requiring the version control software to be installed at the customer site.

SVN/Git all offer wonderful features for versioninig source code within a company, but has anyone had experience with bundling them in their final product?