libbullet-extras-dev 2.81-rev2613+dfsg2-1 (i386 binary) in ubuntu saucy

 Bullet professional 3D Game Multiphysics Library provides state of the art
 collision detection, soft body and rigid body dynamics.
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 This package contains extra development files for Bullet.
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 For more information about Bullet, please refer to the libbullet-dev package.