Problem with GRC

Hi everyone.
I am newbie in Gnu radio. I wanted to install gnu radio on ubunti 12.10
using the build_gnuradi script, but it did not work. in the middle of
the installation the compiler raise a “Unused but set
variable” warning and crashes. I tried this on ubuntu 12.04 and i had
the same problem. SO i decided to installed using this steps from
"sudo bash -c 'echo “deb`lsb_release
-cs lsb_release -cs main" > /etc/apt/sources.list.d/ettus.list' sudo bash -c 'echo "deb
-cs lsb_release -csmain" >> /etc/apt/sources.list.d/ettus.list' sudo apt-get update sudo apt-get install -tlsb_release -cs` uhd gnuradio”.
So finally gnuradio was installed.
I tried to create a flow graph with GRC with a signal source and scope
plot sink but i got this error “raise RuntimeError(“Unable to import
OpenGL. Are Python wrappers for OpenGL installed?”)”
I looked in the internet but i did not find a solution.
So i will grateful for any help.
Thank you

I verified that python-opengl was installed