/usr/local/lib/libBulletSoftBody.a(btSoftBody.o): In function `btSoftBody::updatePose() [clone .part.101]':
btSoftBody.cpp:(.text+0xb7be): undefined reference to `btPolarDecomposition::decompose(btMatrix3x3 const&, btMatrix3x3&, btMatrix3x3&) const'
btSoftBody.cpp:(.text+0xbb23): undefined reference to `btPolarDecomposition::DEFAULT_MAX_ITERATIONS'
btSoftBody.cpp:(.text+0xbb33): undefined reference to `btPolarDecomposition::DEFAULT_TOLERANCE'
btSoftBody.cpp:(.text+0xbb3c): undefined reference to `btPolarDecomposition::btPolarDecomposition(float, unsigned int)'
/usr/local/lib/libBulletSoftBody.a(btSoftBody.o): In function `btSoftBody::updateClusters()':
btSoftBody.cpp:(.text+0xc927): undefined reference to `btPolarDecomposition::decompose(btMatrix3x3 const&, btMatrix3x3&, btMatrix3x3&) const'
btSoftBody.cpp:(.text+0xd093): undefined reference to `btPolarDecomposition::DEFAULT_MAX_ITERATIONS'
btSoftBody.cpp:(.text+0xd0a3): undefined reference to `btPolarDecomposition::DEFAULT_TOLERANCE'
btSoftBody.cpp:(.text+0xd0ac): undefined reference to `btPolarDecomposition::btPolarDecomposition(float, unsigned int)'
/usr/local/lib/libBulletSoftBody.a(btSoftBodyRigidBodyCollisionConfiguration.o): In function `btSoftBodyRigidBodyCollisionConfiguration::~btSoftBodyRigidBodyCollisionConfiguration()':
btSoftBodyRigidBodyCollisionConfiguration.cpp:(.text+0xa4): undefined reference to `btDefaultCollisionConfiguration::~btDefaultCollisionConfiguration()'
/usr/local/lib/libBulletSoftBody.a(btSoftBodyRigidBodyCollisionConfiguration.o): In function `btSoftBodyRigidBodyCollisionConfiguration::btSoftBodyRigidBodyCollisionConfiguration(btDefaultCollisionConstructionInfo const&)':
btSoftBodyRigidBodyCollisionConfiguration.cpp:(.text+0xdb): undefined reference to `btDefaultCollisionConfiguration::btDefaultCollisionConfiguration(btDefaultCollisionConstructionInfo const&)'
btSoftBodyRigidBodyCollisionConfiguration.cpp:(.text+0x292): undefined reference to `btDefaultCollisionConfiguration::~btDefaultCollisionConfiguration()'
/usr/local/lib/libBulletSoftBody.a(btSoftBodyRigidBodyCollisionConfiguration.o): In function `btSoftBodyRigidBodyCollisionConfiguration::~btSoftBodyRigidBodyCollisionConfiguration()':
btSoftBodyRigidBodyCollisionConfiguration.cpp:(.text+0x99): undefined reference to `btDefaultCollisionConfiguration::~btDefaultCollisionConfiguration()'
/usr/local/lib/libBulletSoftBody.a(btSoftBodyRigidBodyCollisionConfiguration.o): In function `btSoftBodyRigidBodyCollisionConfiguration::getCollisionAlgorithmCreateFunc(int, int)':
btSoftBodyRigidBodyCollisionConfiguration.cpp:(.text+0x2da): undefined reference to `btDefaultCollisionConfiguration::getCollisionAlgorithmCreateFunc(int, int)'
/usr/local/lib/libBulletSoftBody.a(btSoftBodyRigidBodyCollisionConfiguration.o):(.data.rel.ro._ZTI41btSoftBodyRigidBodyCollisionConfiguration[_ZTI41btSoftBodyRigidBodyCollisionConfiguration]+0x10): undefined reference to `typeinfo for btDefaultCollisionConfiguration'
/usr/local/lib/libBulletSoftBody.a(btSoftRigidCollisionAlgorithm.o): In function `btSoftRigidCollisionAlgorithm::btSoftRigidCollisionAlgorithm(btPersistentManifold*, btCollisionAlgorithmConstructionInfo const&, btCollisionObjectWrapper const*, btCollisionObjectWrapper const*, bool)':
btSoftRigidCollisionAlgorithm.cpp:(.text+0xd0): undefined reference to `btCollisionAlgorithm::btCollisionAlgorithm(btCollisionAlgorithmConstructionInfo const&)'
/usr/local/lib/libBulletSoftBody.a(btSoftSoftCollisionAlgorithm.o): In function `btSoftSoftCollisionAlgorithm::btSoftSoftCollisionAlgorithm(btPersistentManifold*, btCollisionAlgorithmConstructionInfo const&, btCollisionObjectWrapper const*, btCollisionObjectWrapper const*)':
btSoftSoftCollisionAlgorithm.cpp:(.text+0x68): undefined reference to `btCollisionAlgorithm::btCollisionAlgorithm(btCollisionAlgorithmConstructionInfo const&)'
/usr/local/lib/libBulletSoftBody.a(btSoftBodyConcaveCollisionAlgorithm.o): In function `btSoftBodyConcaveCollisionAlgorithm::btSoftBodyConcaveCollisionAlgorithm(btCollisionAlgorithmConstructionInfo const&, btCollisionObjectWrapper const*, btCollisionObjectWrapper const*, bool)':
btSoftBodyConcaveCollisionAlgorithm.cpp:(.text+0x1518): undefined reference to `btCollisionAlgorithm::btCollisionAlgorithm(btCollisionAlgorithmConstructionInfo const&)'
collect2: error: ld returned 1 exit status
make[2]: *** [bin/patch-lowlevel] Error 1
make[1]: *** [examples/patch-lowlevel/CMakeFiles/patch-lowlevel.dir/all] Error 2
make: *** [all] Error 2
What's wrong?