Step by step install phalcon to ubuntu 14.04

How to Install PHP Phalcon

How to Install PHP Phalcon v2.9

1. Clone specific tag version to working directory
```
# git clone --branch phalcon-v2.0.9 https://github.com/phalcon/cphalcon.git /home/vagrant/cphalcon2.9
```

Wait until cloning process completed. Try to change to cloned directory:
```
[10:12 AM]-[root@andromega]-[/home/vagrant/cphalcon2.9]-[git (phalcon-v2.0.9)]
```

2. Build phalcon
```
cd /home/vagrant/cphalcon2.9/build
sudo ./install
```
You'll see message like this:
```
Libraries have been installed in:
   /home/vagrant/cphalcon2.9/build/64bits/modules

If you ever happen to want to link against installed libraries
in a given directory, LIBDIR, you must either use libtool, and
specify the full pathname of the library, or use the `-LLIBDIR'
flag during linking and do at least one of the following:
   - add LIBDIR to the `LD_LIBRARY_PATH' environment variable
     during execution
   - add LIBDIR to the `LD_RUN_PATH' environment variable
     during linking
   - use the `-Wl,-rpath -Wl,LIBDIR' linker flag
   - have your system administrator add LIBDIR to `/etc/ld.so.conf'

See any operating system documentation about shared libraries for
more information, such as the ld(1) and ld.so(8) manual pages.
----------------------------------------------------------------------

Build complete.
Don't forget to run 'make test'.

Installing shared extensions:     /usr/lib/php5/20131226/
Installing header files:          /usr/include/php5/

Thanks for compiling Phalcon!
Build succeed: Please restart your web server to complete the installation
```

3. Restart Web Server
Try to restart web server: `service apache2 restart` and if php5-fpm installed and configured, try `service php5-fpm restart`;