Php: Error installing v8js on laravel homestead ( vagrant ) on ubuntu

Hello i am having trouble installing v8js on laravel homestead ( vagrant )

After looking at these 2 tuts

1. Install v8js on Linux (works with Homestead)!

2. Installing PHPv8js on Ubuntu!

I Fired up the below commands

$ sudo apt-get install libv8-dev libv8-dbg g++ cpp
$ sudo pecl install v8js-0.1.3

Also note that i typed /opt/v8 when it asked me for the installation prefix of libv8

I Am attaching the screenshot about the errors i am getting

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