CUDA installation

I got the following errors during installation

Processing Dependency: libXi-devel for package: cuda-samples-5-5-5.5-22.x86_64
---> Package libXau.i686 0:1.0.6-4.el6 will be installed
--> Finished Dependency Resolution
Error: Package: cuda-samples-5-5-5.5-22.x86_64 (cuda)
Requires: libXi-devel
Error: Package: cuda-samples-5-5-5.5-22.x86_64 (cuda)
Requires: freeglut-devel
Error: Package: cuda-samples-5-5-5.5-22.x86_64 (cuda)
Requires: libXmu-devel
Error: Package: cuda-samples-5-5-5.5-22.x86_64 (cuda)
Requires: mesa-libGLU-devel
Error: Package: cuda-samples-5-5-5.5-22.x86_64 (cuda)
Requires: libX11-devel
You could try using --skip-broken to work around the problem
You could try running: rpm -Va --nofiles --nodigest

How I may install teh missing packages? DO I need to add a repository and how safe it is?

Jose