Install intl-* extension for PHP in Mac

1.  Dependencies.
install ICU4C.

tar xzvf icu4c-4_4_2-src.tgz
cd icu/source
chmod +x runConfigureICU configure install-sh
./runConfigureICU MacOSX
make && make install

install Autoconf.
brew install autoconf

install PECL.

2. install intl-*.
pecl install intl.

3. update php.ini.

extension=/usr/lib/php/extensions/no-debug-non-zts-20121212/intl.so