d9c3f19e6a
The ARGV filtering would strip `--HEAD` from dependency installations, then proceed with trying to install the dependency from the latest version in the formula. This causes an error if the latest version is already installed, so check to see if formula is installed before performing the installation. Closes Homebrew/homebrew#8869. Signed-off-by: Charlie Sharpsteen <source@sharpsteen.net>
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