On Mon, Jul 16, 2012 at 12:56 AM, Soichi Ishida <lists / ruby-forum.com> wrote:
> Ubuntu 10.04

> *** extconf.rb failed ***

> It says, "Check the mkmf.log...", does anyone know where the file
> resides?

Your main question was already answered but for future reference:

$ find $GEM_HOME -type f -name 'mkmf.log' -print

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