I use Bullet (svn version) with double precision (on Linux), by defining
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export CPPFLAGS=-DBT_USE_DOUBLE_PRECISION
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C++ ./out/linuxx86/optimize/src/BulletDynamics/ConstraintSolver/btHingeConstraint.o
src/BulletDynamics/ConstraintSolver/btHingeConstraint.cpp: In member function ‘virtual void btHingeConstraint::solveConstraint(btScalar)’:
src/BulletDynamics/ConstraintSolver/btHingeConstraint.cpp:348: error: no matching function for call to ‘btMax(btScalar, float)’
src/BulletDynamics/ConstraintSolver/btHingeConstraint.cpp:265: warning: unused variable ‘damping’
Cheers,
Ola