title: pecl install trader ends in ERROR: `phpize' failed
body: <p>I'm trying to install the trader extension.
  I successfully installed pear/pecl.
  When first running the command "pecl install trader" I had some issues on folders that were not writable, so I manually give those read/write permissions.
  Now I'm at the point I get "ERROR: `phpize' failed"</p>
  
  <p>Please how to get this solved? 
  I run mamp server on a mac 10.6.8</p>
  
  <hr>
  
  <pre><code>computer-van-gebruiker:~ Gebruiker$ sudo pecl install trader
  Password:
  WARNING: channel "pecl.php.net" has updated its protocols, use "pecl channel-update pecl.php.net" to update
  
  Warning: Invalid argument supplied for foreach() in PEAR/Downloader.php on line 593
  
  Warning: Invalid argument supplied for foreach() in /usr/local/pear/share/pear/PEAR/Downloader.php on line 593
  downloading trader-0.4.0.tgz ...
  Starting to download trader-0.4.0.tgz (298,434 bytes)
  ...........................done: 298,434 bytes
  
  Warning: Invalid argument supplied for foreach() in PEAR/PackageFile/v2/Validator.php on line 870
  
  Warning: Invalid argument supplied for foreach() in /usr/local/pear/share/pear/PEAR/PackageFile/v2/Validator.php on line 870
  332 source files, building
  running: phpize
  grep: /usr/include/php/main/php.h: No such file or directory
  grep: /usr/include/php/Zend/zend_modules.h: No such file or directory
  grep: /usr/include/php/Zend/zend_extensions.h: No such file or directory
  Configuring for:
  PHP Api Version:
  Zend Module Api No:
  Zend Extension Api No:
  Cannot find autoconf. Please check your autoconf installation and the
  $PHP_AUTOCONF environment variable. Then, rerun this script.
  
  ERROR: `phpize' failed
  </code></pre>