I downloaded opencv-2.4.8.zip on ubuntu. Whats next?

edit

I don't know what to do next. Q: Do I have to compile it? How?

I tried this:

$ pkg-config opencv --cflags Package opencv was not found in the pkg-config search path. Perhaps you should add the directory containing `opencv.pc' to the PKG_CONFIG_PATH environment variable No package 'opencv' found

Any leads appreciated! -cellurl