diff --git a/games/glPortal/bullet286.patch b/games/glPortal/bullet286.patch
new file mode 100644
index 0000000000..69e204a80b
--- /dev/null
+++ b/games/glPortal/bullet286.patch
@@ -0,0 +1,38 @@
+commit 08df5951c9bbcf16234289eaef99c51e3f8bed13
+Author: Henry Hirsch <henry@w3-net.de>
+Date:   Tue Feb 28 21:08:04 2017 +0100
+
+    Port uncollider to bullet 2.86
+
+diff --git a/source/physics/Uncollider.cpp b/source/physics/Uncollider.cpp
+index 99ffc79..8f60885 100644
+--- a/source/physics/Uncollider.cpp
++++ b/source/physics/Uncollider.cpp
+@@ -72,19 +72,24 @@ void Uncollider::nearCallback(btBroadphasePair &collisionPair,
+ 
+   btCollisionObject *colObj0 = (btCollisionObject*)collisionPair.m_pProxy0->m_clientObject;
+   btCollisionObject *colObj1 = (btCollisionObject*)collisionPair.m_pProxy1->m_clientObject;
+-  
++
+   if (dispatcher.needsCollision(colObj0, colObj1)) {
+     btCollisionObjectWrapper obj0Wrap(0, colObj0->getCollisionShape(),
+       colObj0, colObj0->getWorldTransform(), -1, -1);
+     btCollisionObjectWrapper obj1Wrap(0, colObj1->getCollisionShape(),
+       colObj1, colObj1->getWorldTransform(), -1, -1);
+ 
++    btManifoldResult contactPointResult(&obj0Wrap, &obj1Wrap);
++
+     if (not collisionPair.m_algorithm) {
+-      collisionPair.m_algorithm = dispatcher.findAlgorithm(&obj0Wrap, &obj1Wrap);
++
++      collisionPair.m_algorithm =
++        dispatcher.findAlgorithm(&obj0Wrap, &obj1Wrap,
++                                 contactPointResult.getPersistentManifold(),
++                                 ebtDispatcherQueryType::BT_CONTACT_POINT_ALGORITHMS);
+     }
+ 
+     if (collisionPair.m_algorithm) {
+-      btManifoldResult contactPointResult(&obj0Wrap, &obj1Wrap);
+       if (dispatchInfo.m_dispatchFunc == btDispatcherInfo::DISPATCH_DISCRETE) {
+         collisionPair.m_algorithm->processCollision(&obj0Wrap, &obj1Wrap, dispatchInfo,
+           &contactPointResult);
diff --git a/games/glPortal/glPortal.SlackBuild b/games/glPortal/glPortal.SlackBuild
index 7ce3f7ab0e..d713d260b7 100644
--- a/games/glPortal/glPortal.SlackBuild
+++ b/games/glPortal/glPortal.SlackBuild
@@ -86,6 +86,9 @@ find -L . \
  \( -perm 666 -o -perm 664 -o -perm 640 -o -perm 600 -o -perm 444 \
   -o -perm 440 -o -perm 400 \) -exec chmod 644 {} \;
 
+cd source/engine
+patch -p2 < $CWD/bullet286.patch
+cd ../..
 mkdir -p build
 cd build
   cmake \