Hi,

At Mon, 13 Sep 2010 02:49:33 +0900,
Caio Chassot wrote in [ruby-core:32341]:
> > > (All on OS X 10.6)
(snip)
> > >  *** Exception NotImplementedError in
> > >  PhusionPassenger::Rack::ApplicationSpawner (send_io() function is
> > >  unimplemented on this machine) (process 31302): กฤ
> > >
> > > Reinstalling ruby as x86_64 only fixes it.

I had disabled the feature on 64bit darwin due to a bug in the
system header /usr/include/i386/_param.h of darwin 9.8.  So it
should not be enabled by just installing as x86_64 only.

------------------------------------------------------------------------
r27530 | nobu | 2010-04-28 17:14:18 +0900 (Wed, 28 Apr 2010) | 2 lines

* ext/socket/extconf.rb: CMSG_ macros are broken on 64bit darwin,
  because of use of __DARWIN_ALIGN.
------------------------------------------------------------------------

To use this feature, you have to revert this commit at least, and
to run, the system header has to have been fixed already.

-- 
Nobu Nakada