$PHP_AUTOCONF errors on mac os x 10.7.3 when trying to install pecl extensions

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