Thank you @jerrysievert. I had already been faced to those issues. API changes doesn't really matter unless you want to keep running behind Google V8 team and there dreams about JS implementation and tuning.
In the other hand, I totally agree with. the build requirement is a mess and not everyone may have the nerves and passion to build V8. That's way I provide a small piece of shell script to build v8 locally as well as pre-built static library stored in an Amazon S3.
