OpenCV Error: Unspecified Error(The Function is not implemented)

Ubuntu 或者 Debian 系统显示窗口的时候遇到了这个问题

error: (-2: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 function ‘cvNamedWindow’

解决办法：

需要先安装gtk2.0库，再安装opencv

1、apt-getinstall install libgtk2.0-dev

2、安装成功之后，重新运行cmake对opencv的源码进行编译，安装