nvidia-331-updates-dev include files not instelled

Hi

I am new to Linux system administration. I am trying to install the header files for OpenGL development from NVIDIA.

I have installed nvidia-331-updates-dev , the documentation of this pacakge for Precise Pangolin lists the foillowing files:

/usr/include/nvidia-331-updates/CL/cl.h
/usr/include/nvidia-331-updates/CL/cl_gl.h
/usr/include/nvidia-331-updates/CL/cl_platform.h
/usr/include/nvidia-331-updates/GL/gl.h
/usr/include/nvidia-331-updates/GL/glext.h
/usr/include/nvidia-331-updates/GL/glx.h
/usr/include/nvidia-331-updates/GL/glxext.h
/usr/include/nvidia-331-updates/cuda/cuda.h
/usr/include/nvidia-331-updates/cuda/cudaGL.h
/usr/include/nvidia-331-updates/cuda/cudaVDPAU.h
/usr/share/doc/nvidia-331-updates-dev/changelog.Debian.gz
/usr/share/doc/nvidia-331-updates-dev/copyright
/usr/share/doc/nvidia-331-updates-dev/include

(see http://packages.ubuntu.com/precise-updates/i386/nvidia-331-updates-dev/filelist)

which include for example GL/gl.h

the documentation of Trusty lists only

/usr/share/doc/nvidia-331-updates-dev/changelog.Debian.gz
/usr/share/doc/nvidia-331-updates-dev/copyright
/usr/share/doc/nvidia-331-updates-dev/include

(see http://packages.ubuntu.com/trusty/amd64/nvidia-331-updates-dev/filelist)

what is the correct why under Trusty to install the reguired includes files, as under precise Pangolin ?

Thank you so much for your kind attention !

Best Regards,

Andrea