How to make php_xxhash.dll?

[LeMoussel]

In bin directory, there is php_xxhash.dll
What is Git repository for this DLL?
How can I compil source code to make this dll?

[jaspervdm]

This repo has been used to compile xxhash. The readme contains some information to compile it either on unix or windows. If you get stuck at some point, let me know and I will try to help you.