For Ubuntu 16.04 LTS (Xenial Xerus), please type:
$ sudo apt-get install intltool libtool-bin autoconf automake autopoint cmake gcc g++ bison flex gawk gperf ruby git libversion-perl libgnutls-dev libexpat-dev libxml2-dev libxslt-dev libsqlite3-dev libjpeg9-dev libfreetype6-dev libharfbuzz-dev libxcb-xkb-dev libwayland-dev libgbm-dev libgles2-mesa-dev libgstreamer1.0-dev libwebp-dev yasm ninja-build luajit libluajit-5.1-dev weston
From the root directory, please type:
$ Tools/Scripts/update-webkitwpe-libs
$ Tools/Scripts/build-webkit --wpe
If it is not already the case, you will need to execute a Wayland compositor.
To do this quickly under Ubuntu 16.04 LTS (Xenial Xerus), please type:
$ weston --socket=wpe
Then, to run WPEWebKit:
$ WAYLAND_DISPLAY=wpe Tools/Scripts/run-minibrowser --wpe
$ WAYLAND_DISPLAY=wpe Tools/Scripts/run-minibrowser --wpe http://www.bouncyballs.org