how to install v8js

you can ref this:
http://www.phpied.com/installing-v8js-for-php-on-a-mac/

if you have no pear and pecl, you can ref this:
http://jason.pureconcepts.net/2012/10/install-pear-pecl-mac-os-x/

step:

0. install v8

brew install v8

1. download pear

curl -O http://pear.php.net/go-pear.phar

2. install pear

sudo php -d detect_unicode=0 go-pear.phar

3. check pear and pecl version

pear version
pecl version

4. install v8js

sudo pecl install v8js-beta

5. install autoconf

brew install autoconf

6. vi /etc/php.ini, add to extension=v8js.so

7. restart your server, and you can check phpinfo, v8js should be contain.