in reply to Can't install DBI or DBD::mysql after Mountain Lion

I think that the developer-tools on the installation media must be installed. (And I always buy physical media.)
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Re: Can't install DBI or DBD::mysql after Mountain Lion
by cord-bin (Friar) on Oct 11, 2012 at 20:41 UTC
    This also happened to me when upgrading to Mountain Lion and removed the commandline tools. I had to go to Xcode and install again and now it works.
      Sorry, I didn't make it clear before that I have already installed the latest Xcode, but it doesn't seem to have helped.

        Simply installing XCode no longer installs the command line tools-- you have to launch XCode and tell it to install them. It's another new annoyance from Apple.