can't find libz for a plone install on osx. brew tap homebrew/dups did not find it

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THe plone installer complains that libz is missing on OSX Yosemite. brew can't find it, even after doing a "tap homebrew/dups".

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SteveM On

Try resetting your XCode command-line development environment:

sudo xcode-select -r

If that doesn't do it, reinstall XCode's command-line tools:

sudo xcode-select --install

Problems finding headers and libraries are common in upgraded XCode environments, but this should fix it.