mongocrypt_version() returns a version like "1.0.0-beta4". This version is updated when a new release is tagged (like in https://github.com/mongodb/libmongocrypt/commit/91413d5c41c75201caa88a58744c240b21cd90a7).

The problem here is that all the commits/builds in between two releases all share the same version number so there is no way to distinguish a user with the actual "1.0.0-beta4" build and one that's a few commits ahead.

For reference the mongodb binaries avoid this problem by including the git SHA in the version as well as the number of commits ahead of the previous tag:

$ mongodb-macos-x86_64-4.1.10-298-ga406d41/bin/mongo --version
MongoDB shell version v4.1.10-298-ga406d41
git version: a406d4152133336a2966ebae0612adc58244e7fd
...