Hi Markus,

I'm glad to hear things are working for you now.  I suggest that you file a
ticket on the opencv tracker to make sure this gets fixed for everyone.
https://code.ros.org/trac/opencv/wiki

Tully

On Wed, May 4, 2011 at 1:12 AM, Markus Eich <markus.eich@dfki.de> wrote:

> I solved the issue.
> Inorder to build ROS from source under Natty I just applied this modified
> patch (copied it to the opencv2 folder) and added the line
>
> SVN_PATCH = pythontest.patch v4l_2.6.38.patch
>
> to the Makefile.
>
> The Opencv package now builds with Natty (but i guess not with older Ubuntu
> anymore ;-)
>
> Make sure that libv4l-dev is installed.
>
>
> Cheers,
>
> Markus
>
>
>
>
>
>
>
>
>
> On 03.05.2011 22:41, Markus Eich wrote:
>
>> Dear all,
>>
>> I am facing a problem with compiling the ROS sources under Natty.
>>
>> While building the opencv2 package, I got the following linking error:
>>
>>
>> ==============================
>> Linking CXX static library ../../lib/libopencv_haartraining_engine.a
>> [ 80%] Built target opencv_haartraining_engine
>> Scanning dependencies of target opencv_createsamples
>> [ 80%] Building CXX object
>> modules/haartraining/CMakeFiles/opencv_createsamples.dir/createsamples.o
>> Linking CXX executable ../../bin/opencv_createsamples
>> ../../lib/libopencv_highgui.so.2.2.0: undefined reference to
>> `cvCreateCameraCapture_V4L(int)'
>> collect2: ld returned 1 exit status
>> make[2]: *** [bin/opencv_createsamples] Fehler 1
>> make[1]: ***
>> [modules/haartraining/CMakeFiles/opencv_createsamples.dir/all] Fehler 2
>> ==============================
>>
>> It seems it has to do with the linking of V4L. I have the lib4vl-dev
>> package installed.
>> According to my prior web search there seems to be the issue that V4L
>> has moved out of the kernel source.
>>
>> Do you have any clues?
>>
>> Cheers,
>>
>> Markus
>> _______________________________________________
>> ros-users mailing list
>> ros-users@code.ros.org
>> https://code.ros.org/mailman/listinfo/ros-users
>>
>
>
> --
> Dipl. Inf. Markus Eich
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>
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-- 
Tully Foote
Systems Engineer
Willow Garage, Inc.
tfoote@willowgarage.com
(650) 475-2827