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I am trying to install OpenCV 2.4.3 on Mac OSX 10.7.5 by using MacPort. I installed opencv 2.4.4 through homebrew. But when I tried linking the libraries I keep getting an error when compiling the program through qmake (Qt): symbols not found architecture _x86-64. So now I am trying to install opencv 2.4.3 through MacPort but I keep getting the following error:

Linking CXX shared library ../../lib/libopencv_highgui.dylib
ld: library not found for -lmp3lame
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[2]: *** [lib/libopencv_highgui.2.4.3.dylib] Error 1
make[1]: *** [modules/highgui/CMakeFiles/opencv_highgui.dir/all] Error 2
make: *** [all] Error 2

Any help would be much appreciated.

flash
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  • it would be nice to see more information about your installation process: are you installing it using some documentation? or may be you installing it using brew or else? Right now all I can say is it can't find mp3lame library. – cody Apr 06 '13 at 07:15
  • I just edited my post. I hope this can give you more information. Thanks – flash Apr 06 '13 at 15:44

3 Answers3

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  • With opencv installed using homebrew you should probably add additional search paths to your makefile (note that opencv must be installed without --32-bit flag). Also you can try to install it with flag --with-qt (see brew info opencv). Also take a look here - may be it is your case.
  • For the errors during installation via macports: just install all dependencies first. In your case probably sudo port install lame.
  • Also you can install it by yourself using install guide, this(OS X 10.7) or this(OS X 10.8) tutorial for example
  • Check related questions in the right column on this page - they also can be helpful.
Community
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cody
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Your linker is telling you that:

  1. Qt was not installed on your machine (or at least in a location where the shell was not aware of) ;

  2. lame (and the associated library) is not installed on your system. If it is, then it is located (as per macports standards) installed in the /opt/ directory, which is not in the search path by default. You have to modifiy your .bashrc or your .profile file to add it.

In order to install OpenCV on MacOS, I would definitely recommend using either compile from the source (on github) or installing from homebrew. In the first case you control each option passed to cmake in order to fit your system, while in the second you have a more reactive community (according to my experience) to solve installation issues and stick with the latest releases.

sansuiso
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I formatted my hard drive, thus deleting everything. I re-downloaded Qt Creater and its corresponding libraries for mac and installed OpenCV through MacPorts. Everything went smoothly and I am now using OpenCV on Qt. I guess I might have done something wrong the first time. Thanks to everyone who tried helping me. I appreciate your time and efforts.

flash
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