How to properly install OpenCV on Ubuntu?

I'm trying to install OpenCV 2.2.0 on Ubuntu 12.04, but I'm getting this error:

torul@torul-HP-Compaq-8200-Elite-CMT-PC:~/OpenCV-2.2.0/opencv.build$ make make[2]: *** [modules/core/CMakeFiles/opencv_core.dir/src/rand.o] Error 1make[1]: *** [modules/core/CMakeFiles/opencv_core.dir/all] Error 2make: *** [all] Error 2

Could anyone tell me, what am I doing wrong (why am I getting the above error) ?