pkg和gtk安装

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libgtk2.0-dev and pkg-config

在终端下输入命令
sudoapt−getinstalllibgtk2.0−dev如果你想安装版本高一点的：sudo apt-get install libgtk3.0-dev
同理
$sudo apt-get install pkg-config

安装这个，是为了接下来调用并编译OpenCV库函数，否则你可能在运行OpenCV库函数过程中，遇到如下问题：
OpenCV Error: Unspecified error (The function is not implemented. Rebuild the library with Windows, GTK+ 2.x or Carbon support. If you are on Ubuntu or Debian, install libgtk2.0-dev and pkg-config, then re-run cmake or configure script) in cvWaitKey, file /home/opennao/src/OpenCV-2.3.1/modules/highgui/src/window.cpp, line 354
terminate called after throwing an instance of ‘cv::Exception’
what(): /home/opennao/src/OpenCV-2.3.1/modules/highgui/src/window.cpp:354: error: (-2) The function is not implemented. Rebuild the library with Windows, GTK+ 2.x or Carbon support. If you are on Ubuntu or Debian, install libgtk2.0-dev and pkg-config, then re-run cmake or configure script in function cvWaitKey

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