What is the proper way of adding a local dependency (openCV) in Meson?

Question

I am using OpenCV in one of my projects. Until now, I was using version 3 under Ubuntu 18.04, so in my meson.build I had:

... dependencies: [dependency('opencv')])

Now, I've compiled OpenCV 4 from source and installed to the default dir, /usr/local/, and changed my meson.build to:

... dependencies: [dependency('opencv4')])

Resulting in a not found error (despite this works with Ubuntu 20.04 and the package from the official repos, which is version 4.2). How should I specify the library's location so Meson can find it?

I've seen find_library, but that's deprecated according the docs.

Elvis Oric · Accepted Answer · 2020-05-27T19:35:44.900

4

The dependency function is using pkg-config or cmake if pkg-config fails, to find external dependency (installed library).

When you install OpenCV4, please check if there is pkg-config for opencv4. Here is my command:

pkg-config --list-all | grep "opencv4"

and output:

opencv4 OpenCV - Open Source Computer Vision Library

Also, check PKG_CONFIG_PATH environment variable. pkg-config will use that path to search for .pc files.

Edit: be sure to use -D OPENCV_GENERATE_PKGCONFIG=YES when building opencv with cmake.

edited May 27 '20 at 19:35

answered May 27 '20 at 16:55

Elvis Oric

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Ok, so those commands return nothing, and $PKG_CONFIG_PATH seems empty. Should I try to create my own .pc file? – dvilela May 27 '20 at 19:26
I seems that OpenCV [dropped pkg_config support](https://github.com/opencv/opencv/issues/13154). – dvilela May 27 '20 at 19:27
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When compiling with `cmake`, did you set `-D OPENCV_GENERATE_PKGCONFIG=YES` ? – Elvis Oric May 27 '20 at 19:32
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So, I edited my answer to include part from the previous comment. – Elvis Oric May 27 '20 at 19:36

What is the proper way of adding a local dependency (openCV) in Meson?

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