系统：VM Ubuntu 14.04 x64
Summary ：
我正在使用https://github.com/Itseez/opencv_contrib的contrib模块构建OpenCV 3.0.0-dev，但我无法从opencv_contrib获取可执行文件 .
我试图按照本教程关于跟踪API：http://docs.opencv.org/trunk/modules/tracking/doc/tracking.html
在某处它说：要了解API如何工作，请尝试跟踪器演示：https://github.com/lenlen/opencv/blob/tracking_api/samples/cpp/tracker.cpp
但这是一个分叉的旧存储库（由用户lenlen），而不是官方存储库 . In the recent versions（使用新的repos）似乎该文件不再位于该位置，而是在：https://github.com/Itseez/opencv_contrib/blob/master/modules/tracking/samples/tracker.cpp
The problem ：我'm being able to build OpenCV without errors, but I can't看看如何从opencv_contrib构建该可执行文件，或者它位于何处 .
I've tried ：
-
设置
OPENCV_EXTRA_MODULES_PATHwith：cmake -D OPENCV_EXTRA_MODULES_PATH=../opencv_contrib/modules .. -
设置
INSTALL_C_EXAMPLES：cmake -D INSTALL_C_EXAMPLES=ON .. -
输入
opencv_contrib，创建并输入“build" directory and from there executing: "cmake ..”......但这会产生错误（没有CMakeLists.txt） . -
输入“
opencv_contrib/modules/tracking/", creating and entering into a "build" directory and executing "cmake ..”（因为tracking目录中有一个CMakeLists.txt） . 但这也会产生错误 . -
输入“
opencv_contrib/modules/tracking/samples/" and executing "g++ tracker.cpp”，但也会出错 .
提前致谢！
1 回答
我解决了这是一个愚蠢的错误 .
我正在设置
OPENCV_EXTRA_MODULES_PATH为：cmake -D OPENCV_EXTRA_MODULES_PATH=../opencv_contrib/modules ..但我的工作目录是“
opencv/build/" (I was in a directory "build" inside of opencv and the "opencv_contrib" was in the same directory as "opencv”），因此变量应该是：cmake -D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib/modules ..