Build problems for openCV 2.4.1 with Ubuntu 12.04 LTS

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Hi!

I'm about to install OpenCV 2.4.1 on Ubuntu 12.04 LTS and during the build process some errors show up:

In file included from /home/thomas/OpenCV-2.4.1/modules/highgui/src/cap_ffmpeg.cpp:45:0:
/home/thomas/OpenCV-2.4.1/modules/highgui/src/cap_ffmpeg_impl.hpp:845:10: error: use of enum ‘CodecID’ without previous declaration
/home/thomas/OpenCV-2.4.1/modules/highgui/src/cap_ffmpeg_impl.hpp:845:52: error: invalid type in declaration before ‘;’ token
/home/thomas/OpenCV-2.4.1/modules/highgui/src/cap_ffmpeg_impl.hpp:897:46: error: ‘CodecID’ has not been declared
/home/thomas/OpenCV-2.4.1/modules/highgui/src/cap_ffmpeg_impl.hpp: In function ‘AVStream* icv_add_video_stream_FFMPEG(AVFormatContext*, int, int, int, int, double, int)’:
/home/thomas/OpenCV-2.4.1/modules/highgui/src/cap_ffmpeg_impl.hpp:930:23: error: invalid conversion from ‘int’ to ‘AVCodecID’ [-fpermissive]
In file included from /home/thomas/OpenCV-2.4.1/modules/highgui/src/cap_ffmpeg.cpp:45:0:
/home/thomas/OpenCV-2.4.1/modules/highgui/src/cap_ffmpeg_impl.hpp: In member function ‘bool CvVideoWriter_FFMPEG::open(const char*, int, double, int, int, bool)’:
/home/thomas/OpenCV-2.4.1/modules/highgui/src/cap_ffmpeg_impl.hpp:1276:5: error: ‘CodecID’ was not declared in this scope
/home/thomas/OpenCV-2.4.1/modules/highgui/src/cap_ffmpeg_impl.hpp:1276:13: error: expected ‘;’ before ‘codec_id’
/home/thomas/OpenCV-2.4.1/modules/highgui/src/cap_ffmpeg_impl.hpp:1321:10: error: ‘codec_id’ was not declared in this scope
/home/thomas/OpenCV-2.4.1/modules/highgui/src/cap_ffmpeg_impl.hpp:1341:13: error: ‘codec_id’ was not declared in this scope
/home/thomas/OpenCV-2.4.1/modules/highgui/src/cap_ffmpeg_impl.hpp:1370:48: error: ‘codec_id’ was not declared in this scope
make[2]: *** [modules/highgui/CMakeFiles/opencv_highgui.dir/src/cap_ffmpeg.cpp.o] Error 1
make[1]: *** [modules/highgui/CMakeFiles/opencv_highgui.dir/all] Error 2
make: *** [all] Error 2

Anyone who have an idea about how to correct this or experienced the same errors? I have tried to see if there are some missed includes somewhere but can't find anything.

Thanks!

Regards Thomas