version the pkg-config file and use standard CMake for formatting

AprilRobotics / apriltag

AprilTag is a visual fiducial system popular for robotics research.

https://april.eecs.umich.edu/software/apriltag

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version the pkg-config file and use standard CMake for formatting #251

Closed christian-rauch closed 1 year ago

christian-rauch commented 1 year ago

I noticed that the version on the apriltag.pc file was hard coded. CMake provides configure_file to format such a file automatically, including the version.