CMake 在自定义安装路径中找不到 FFMPEG
我正在 Ubuntu 10.10 上编译一个项目的依赖项，默认情况下我没有将其安装到 /usr/local，而是将其安装到 /tmp/stage/usr/local。当我调用 CMake 来生成所述项目的构建文件时，如何通知 CMake 此自定义安装依赖项的位置。
我正在运行CMAKE 2.8.1，并且我尝试在CMake命令行上设置CMAKE_PREFIX_PATH，
cmake -D CMAKE_PREFIX_PATH=/tmp/stage/usr/local
但这似乎并没有什么不同 - 该项目似乎并没有检测到依赖关系。
另外，如果重要的话，所讨论的项目是 OpenCV 2.2，所讨论的依赖项是 FFMPEG...
I am compiling a dependency for a project on Ubuntu 10.10, and instead of having it install to /usr/local by default, I am instead installing it to /tmp/stage/usr/local. How do I go about informing CMake of the location of this custom installed dependency when I call it to generate the build files for said project.
I am running CMake 2.8.1, and I have tried to set CMAKE_PREFIX_PATH on the cmake command line, like so
cmake -D CMAKE_PREFIX_PATH=/tmp/stage/usr/local
but this doesn't seem to make a difference - the project doesn't seem to detect the dependency.
Also, if it matters, the project in question is OpenCV 2.2, and the dependency in question is FFMPEG...
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我想出了如何解决我的问题，并且尝试将 CMake 指向适当的安装位置不是问题。
显然，CMake 无法找到 FFMPEG 的 pkg-config 文件（即 libavcodec.pc、libavdevice.pc 等）来告诉它 FFMPEG 标头和库的位置。在典型的安装场景中，这些文件将位于 /usr/lib/pkgconfig。但是，由于自定义安装位置，它们位于 /tmp/stage/usr/local/lib/pkgconfig。
为了让 CMake 能够找到这些文件，我必须添加以下环境变量：
之后，OpenCV 按预期针对 FFMPEG 进行构建。
I figured out how to fix my problem, and trying to point CMake at the appropriate install location isn't the issue.
Apparently, CMake is unable to find the pkg-config files for FFMPEG (i.e. libavcodec.pc, libavdevice.pc, etc.) that tell it where the FFMPEG headers and libraries are located. In a typical install scenario, these files would be located at /usr/lib/pkgconfig. However because of the custom install location, they are instead located at /tmp/stage/usr/local/lib/pkgconfig.
So that CMake could find these files, I had to add the following environment variable:
After which point, OpenCV built against FFMPEG as expected.