Multiple problems trying to download MRITRIX3

From your error message I take that you did not use homebrew but tried to compile mrtrix3 yourself. You can install the dependencies with homebrew as described here:

Install Qt5: brew install qt5
Install pkg-config: brew install pkg-config
Add Qt’s binaries to your path: export PATH=`brew --prefix`/opt/qt5/bin:$PATH

and then repeat ./configure && ./build (in the same shell).

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