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Treating doxygen as a formula. For the cask, use homebrew/cask/doxygen or specify the `--cask` flag. To silence this message, use the `--formula` flag.

xz 5.6.3 is already installed and up-to-date. To reinstall 5.6.3, run: brew reinstall xz

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

libtool 2.5.4 is already installed and up-to-date. To reinstall 2.5.4, run: brew reinstall libtool