tce-load -i intltool webkitgtk4-dev gnome-desktop-dev gcr-dev avahi-dev libwnck-dev nss-dev itstool

cd epiphany-3.22.0

CC="gcc -flto -fuse-linker-plugin -mtune=generic -Os -pipe" CXX="g++ -flto -fuse-linker-plugin -mtune=generic -Os -pipe -fno-exceptions -fno-rtti" ./configure --prefix=/usr/local --disable-static --localstatedir=/var --libexecdir=/usr/local/lib/epiphany

make
sudo make install

Epiphany was configured with the following options:

        Source code location       : .
        Compiler                   : gcc -flto -fuse-linker-plugin -mtune=generic -Os -pipe
        Prefix                     : /usr/local
        Extra debugging support    : no
        Build tests                : yes
        Code coverage              : no