Fix space mouse build on OS X
Fix space mouse build on OS X

[ ] May break build
[ ] May break existing applications (see CHANGES.txt)
[x] Bugfix
[ ] New Feature
[x] Cleanup
[ ] Optimization
[ ] Documentation

jafyvilla/CMake,BlueBrain/Tuvok,rballester/vmmlib,ptoharia/CMake,biddisco/CMake,shurikasa/CMake,hernando/vmmlib,shuaibarshad/KAUST-CMake,ptoharia/CMake,biddisco/CMake,tribal-tec/vmmlib,BlueBrain/Tuvok,rballester/vmmlib,biddisco/CMake,shuaibarshad/KAUST-CMake,ptoharia/CMake,jafyvilla/CMake,hernando/vmmlib,shuaibarshad/KAUST-CMake,jafyvilla/CMake,biddisco/CMake,shuaibarshad/KAUST-CMake,shurikasa/CMake,hernando/vmmlib,ptoharia/CMake,rballester/vmmlib,jafyvilla/CMake,shurikasa/CMake,shurikasa/CMake,BlueBrain/Tuvok