Qt3D Fails to compile when assimp is installed

I get a compile error in Qt3D when building Qt 5.9.0 Alpha on Ubuntu Linux.
If the assimp packages are installed, Qt3D fails to compile.

These are the errors:
assimpimporter.cpp: In member function ‘void Qt3DRender::AssimpImporter::loadAnimation(uint)’:
assimpimporter.cpp:1100:38: error: ‘struct aiAnimation’ has no member named ‘mNumMorphMeshChannels’
for (uint i = 0; i < assimpAnim->mNumMorphMeshChannels; ++i) {
^
assimpimporter.cpp:1101:9: error: ‘aiMeshMorphAnim’ was not declared in this scope
aiMeshMorphAnim *morphAnim = assimpAnim->mMorphMeshChannels[i];
^
assimpimporter.cpp:1101:26: error: ‘morphAnim’ was not declared in this scope
aiMeshMorphAnim *morphAnim = assimpAnim->mMorphMeshChannels[i];
^
assimpimporter.cpp:1101:50: error: ‘struct aiAnimation’ has no member named ‘mMorphMeshChannels’
aiMeshMorphAnim *morphAnim = assimpAnim->mMorphMeshChannels[i];
^
assimpimporter.cpp:1111:13: error: ‘aiMeshMorphKey’ was not declared in this scope
aiMeshMorphKey &key = morphAnim->mKeys[j];
^
assimpimporter.cpp:1111:29: error: ‘key’ was not declared in this scope
aiMeshMorphKey &key = morphAnim->mKeys[j];
^
assimpimporter.cpp:1127:45: error: ‘struct aiMesh’ has no member named ‘mMethod’
morphingAnimation->setMethod((mesh->mMethod == aiMorphingMethod_MORPH_NORMALIZED)
^
assimpimporter.cpp:1127:56: error: ‘aiMorphingMethod_MORPH_NORMALIZED’ was not declared in this scope
morphingAnimation->setMethod((mesh->mMethod == aiMorphingMethod_MORPH_NORMALIZED)
^
Makefile:2449: recipe for target '.obj/assimpimporter.o' failed
make[4]: *** [.obj/assimpimporter.o] Error 1
make[4]: Leaving directory '/home/tranter/ics/qt-everywhere-opensource-src-5.9.0-alpha/qt3d/src/plugins/sceneparsers/assimp'
Makefile:44: recipe for target 'sub-assimp-make_first' failed
make[3]: *** [sub-assimp-make_first] Error 2
make[3]: Leaving directory '/home/tranter/ics/qt-everywhere-opensource-src-5.9.0-alpha/qt3d/src/plugins/sceneparsers'
Makefile:529: recipe for target 'sub-plugins-sceneparsers-make_first' failed
make[2]: *** [sub-plugins-sceneparsers-make_first] Error 2
make[2]: Leaving directory '/home/tranter/ics/qt-everywhere-opensource-src-5.9.0-alpha/qt3d/src'
Makefile:45: recipe for target 'sub-src-make_first' failed
make[1]: *** [sub-src-make_first] Error 2
make[1]: Leaving directory '/home/tranter/ics/qt-everywhere-opensource-src-5.9.0-alpha/qt3d'
Makefile:488: recipe for target 'module-qt3d-make_first' failed
make: *** [module-qt3d-make_first] Error 2