Installing OpenCV on Raspberry Pi: can't find packages

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http://stackoverflow.com – I'm trying to install OpenCV 2.4.7 on Raspberry Pi (Model B, OS: Raspbian). The guides I'm referring to are: 1. RASPBERRY PI + SIMPLECV + OPENCV + RASPICAM CSI CAMERA 2. Raspberry Pi + OpenCV 3. Raspberry Pi Rasbian + OpenCV 4. Setting everything up for OpenCV – Raspberry Pi The problem is that I can't install all the required packages in order to be able to install OpenCV since I get the error:E: Unable to locate package package_name. Here the list of packages I can't install (output of raspbian terminal): Reading package lists... Done Building dependency tree Reading state information.. (HowTos)