The error message is :
Package gtk+-3.0 was not found in the pkg-config search path.
Perhaps you should add the directory containing `gtk+-3.0.pc'
to the PKG_CONFIG_PATH environment variable
No package 'gtk+-3.0' found
The commands used to fix this error are:
sudo port install webkit2-gtk
sudo port install webkit-gtk3
I hope you like this video. If you have any problem or error, write a comment. Don't forget to tell me if it works with you or not.