Steps for getting PECL OAuth (or any PECL package really) install on OS Lion 10.7.3 with Xcode 4.3+ (requires CLI tools to be installed already)

pecl_install_steps.txt

1) install PEAR / PECL
     $ cd /usr/lib/php
     $ sudo php install-pear-nozlib.phar

2) install autoconf 2.13 via homebrew
     either pull from me here: https://github.com/jsjohnst/homebrew
       or
     $ cd /usr/local/Library/Formula/
     $ vi autoconf.rb
            
require 'formula'

class Autoconf < Formula
  url 'http://ftp.gnu.org/gnu/autoconf/autoconf-2.13.tar.gz'
  homepage 'http://www.gnu.org/software/autoconf/'
  md5 '9de56d4a161a723228220b0f425dc711'

  def install
    system "./configure", "--program-suffix=213",
                          "--prefix=#{prefix}",
                          "--infodir=#{info}"
    system "make install"
  end
end

3) set environment variables
     $ export PHP_AUTOCONF=/usr/local/bin/autoconf213
     $ export PHP_AUTOHEADER=/usr/local/bin/autoheader213

4) unfortunately sudo peck install oath still doesn't work right, so you must download / install manually
     $ pecl download oauth
     $ tar -xzvf oauth-1.2.2.tgz
     $ cd oauth-1.2.2
     $ phpize
     $ ./configure
     $ make
     $ sudo make install

5) Enable the module in php.ini
     $ sudo vi /etc/php.ini

extension=/usr/lib/php/extensions/no-debug-non-zts-20090626/oauth.so