尝试安装pecl扩展名时在Mac OS X 10.7.3上出现$ PHP_AUTOCONF错误

我正在尝试使用pecl_http和memcache设置计算机，在两种情况下，我都会遇到类似的错误.这是在MAC OS X 10.7.3(lion)上，而且我还安装了XCODE.在运行这些命令之前，我还安装了Zend Server社区版，并设置了CFLAGS ='-arch i386 -arch x86_64'环境变量.所以请帮忙我需要做的事情

I am trying to setup my machine with pecl_http and memcache and in both cases, I get similar errors. This is on MAC OS X 10.7.3 (lion) and I also have XCODE installed on it. I also installed Zend Server community edition before running these commands and have CFLAGS='-arch i386 -arch x86_64' environment variables set. So please help with what I need to do

bash-3.2# **sudo pecl install pecl_http-1.7.1**
downloading pecl_http-1.7.1.tgz ...
Starting to download pecl_http-1.7.1.tgz (174,098 bytes)
.....................................done: 174,098 bytes
71 source files, building
running: phpize
Configuring for:
PHP Api Version:         20090626
Zend Module Api No:      20090626
Zend Extension Api No:   220090626
Cannot find autoconf. Please check your autoconf installation and the
$PHP_AUTOCONF environment variable. Then, rerun this script.
ERROR: `phpize' failed