cmake was installed from the local/pinned tap but you are trying to install it from the homebrew/core tap. Formulae with the same name from different taps cannot be installed at the same time. To install this version, you must first uninstall the existing formula: brew uninstall cmake Then you can install the desired version: brew install cmake

git 2.51.0 is already installed and up-to-date. To reinstall 2.51.0, run: brew reinstall git

wget 1.25.0 is already installed and up-to-date. To reinstall 1.25.0, run: brew reinstall wget

autoconf 2.72 is already installed and up-to-date. To reinstall 2.72, run: brew reinstall autoconf