At the moment there are no binary packages from Bullet library. Once this is done, the libraries will be placed here LinearMath BulletCollision BulletDynamics The C-API will be available in the include folder. For now, there is only C++ files, see src/btBulletCollisionCommon.h and src/btBulletDynamicsCommon.h http://bullet.googlecode.com Erwin Coumans