I used the source code downloaded from github to install opencv. My Cmake command is as follows: cmake \ -DCMAKE_BUILD_TYPE=Release \ -DCMAKE_INSTALL_PREFIX=/usr/local \ -DOPENCV_ENABLE_NONFREE=1 \ ...

I have been building my zmk firmware via the github actions flow recommended by the documentation. It had been working well, but I went to make a change after several months and the build is failing.