Developers who would like to contribute to the driver will need to build it from VCS like so:
git clone https://github.com/mongodb/mongo-hhvm-driver.git hippo
cd hippo
git submodule update --init
hphpize
cmake .
make configlib
make -j 5
make install
To run the rests, after adjusting the paths:
export TEST_PHP_EXECUTABLE=`which hhvm`
hhvm -vDynamicExtensions.0=/usr/local/hhvm/3.9.1/lib/hhvm/extensions/20150212/mongodb.so run-tests.php