Errors building OpenCV 2.4.9.1 and 3.0.0-beta

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I am trying to build OpenCV 2.4.9.1 under ubuntu 14.10, following the provided instructions.

I have cloned the git repository on my disk, checked out tag 2.4.9.1 and run cmake as per instructions.

Then, when I run make, I get errors, beginning with:

In file included from /home/fanta/eclipse-workspace/3rd_party/opencv/modules/highgui/src/cap_ffmpeg_impl.hpp:60:0,
                 from /home/fanta/eclipse-workspace/3rd_party/opencv/modules/highgui/src/cap_ffmpeg.cpp:45:
/home/fanta/eclipse-workspace/3rd_party/opencv/modules/highgui/src/ffmpeg_codecs.hpp:104:7: error: ‘CODEC_ID_H264’ was not declared in this scope
     { CODEC_ID_H264, MKTAG('H', '2', '6', '4') },
       ^
/home/fanta/eclipse-workspace/3rd_party/opencv/modules/highgui/src/ffmpeg_codecs.hpp:105:7: error: ‘CODEC_ID_H264’ was not declared in this scope
     { CODEC_ID_H264, MKTAG('h', '2', '6', '4') },
       ^
/home/fanta/eclipse-workspace/3rd_party/opencv/modules/highgui/src/ffmpeg_codecs.hpp:106:7: error: ‘CODEC_ID_H264’ was not declared in this scope
     { CODEC_ID_H264, MKTAG('X', '2', '6', '4') },
       ^

I am also getting similar errors when trying to build 3.0.0-beta.

Any clue what I am doing wrong?

Thanks!