diff --git a/src/BulletCollision/CollisionShapes/btCollisionShape.cpp b/src/BulletCollision/CollisionShapes/btCollisionShape.cpp
index cd5b56b37..81d82428f 100644
--- a/src/BulletCollision/CollisionShapes/btCollisionShape.cpp
+++ b/src/BulletCollision/CollisionShapes/btCollisionShape.cpp
@@ -15,6 +15,16 @@ subject to the following restrictions:
 
 #include "BulletCollision/CollisionShapes/btCollisionShape.h"
 
+
+/*
+  Make sure this dummy function never changes so that it
+  can be used by probes that are checking whether the
+  library is actually installed.
+*/
+extern "C" void btBulletCollisionProbe () {}
+
+
+
 void	btCollisionShape::getBoundingSphere(btVector3& center,btScalar& radius) const
 {
 	btTransform tr;
diff --git a/src/BulletDynamics/Dynamics/btSimpleDynamicsWorld.cpp b/src/BulletDynamics/Dynamics/btSimpleDynamicsWorld.cpp
index d3a059df2..460564928 100644
--- a/src/BulletDynamics/Dynamics/btSimpleDynamicsWorld.cpp
+++ b/src/BulletDynamics/Dynamics/btSimpleDynamicsWorld.cpp
@@ -22,6 +22,14 @@ subject to the following restrictions:
 #include "BulletDynamics/ConstraintSolver/btContactSolverInfo.h"
 
 
+/*
+  Make sure this dummy function never changes so that it
+  can be used by probes that are checking whether the
+  library is actually installed.
+*/
+extern "C" void btBulletDynamicsProbe () {}
+
+
 
 
 btSimpleDynamicsWorld::btSimpleDynamicsWorld(btDispatcher* dispatcher,btOverlappingPairCache* pairCache,btConstraintSolver* constraintSolver)
diff --git a/src/LinearMath/btGeometryUtil.cpp b/src/LinearMath/btGeometryUtil.cpp
index 8fc5d3963..283365698 100644
--- a/src/LinearMath/btGeometryUtil.cpp
+++ b/src/LinearMath/btGeometryUtil.cpp
@@ -16,6 +16,15 @@ subject to the following restrictions:
 
 #include "btGeometryUtil.h"
 
+
+/*
+  Make sure this dummy function never changes so that it
+  can be used by probes that are checking whether the
+  library is actually installed.
+*/
+extern "C" void btBulletMathProbe () {}
+
+
 bool	btGeometryUtil::isPointInsidePlanes(const btAlignedObjectArray<btVector3>& planeEquations, const btVector3& point, btScalar	margin)
 {
 	int numbrushes = planeEquations.size();