关键字：anaconda opencv3 yum反悔
我在anaconda的python环境下尝试运行catch_usb_video.py脚本（来源：http://www.cnblogs.com/neo-T/p/6426029.html），结果报以下错误：
OpenCV(3.4.1) 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 cvNamedWindow, file /opt/conda/conda-bld/opencv-suite_1527005194613/work/modules/highgui/src/window.cpp, line 618
Traceback (most recent call last):
File "catch_viedo.py", line 30, in <module>
CatchUsbVideo("截取视频流", int(sys.argv[1]))
File "catch_viedo.py", line 6, in CatchUsbVideo
cv2.namedWindow(window_name)
cv2.error: OpenCV(3.4.1) /opt/conda/conda-bld/opencv-suite_1527005194613/work/modules/highgui/src/window.cpp:618: 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 cvNamedWindow
按照网上搜索到的结果：
1-安装libgnomeui-devel : yum install -y libgnomeui-devel
结果：这个其实只适用Ubuntu，随即就被我删除了，也正是因为这样，我才学会yum是怎么删除包（反悔），且把该包一并下载安装的依赖包都删除，
显示安装那个包的历史yum history list libgnomenui-devel
Loaded plugins: fastestmirror, langpacks
ID | Command line | Date and time | Action(s) | Altered
-------------------------------------------------------------------------------
4 | install libgnomeui-devel | 2018-07-19 20:59 | Install | 89
history list
然后 yum history undo 4，4是ID那一列
2-安装gtk2-devel，结果还是没解决，也是反悔安装了
通过比较其他人在网上反馈的情况，我尝试重装opencv3，所以我执行了以下命令:
1.conda remove opencv
2.conda list | grep opencv 紧接着我又查了conda还包含哪些opencv包，不知道这两个包有没有影响，反正也删除了，如果有人也有的话可以尝试先不删除，看看效果再决定（^_^留言告诉我结果）
libopencv 3.4.1 h1a3b859_1 defaults
py-opencv 3.4.1 py36h0676e08_1 defaults
3.conda remove libopencv py-opencv
4.conda install opencv3
至此，原来的py脚本运行一切正常。
原文地址：https://www.cnblogs.com/ben-lbj/p/9348280.html