Compiling Chromium takes so long time, it takes up to 1 hour only in my i7 processor and it is most likely to take up to 20 hours in the low-end processors such as Intel Atom.
But it is no need for compiling it, you will learn how to install a binary Chromium. Notice that a precompiled package for Google Chrome is also available from the official tree.
Install Chromium from the Sabayon repo:
wget $url$(curl -ls "$url" | grep chromium | grep tbz2 | head -1)
mv "$(curl -ls "$url" | grep chromium | grep tbz2 | head -1)" chromium.tar.bz2
tar -xvjf chromium.tar.bz2
sudo rsync -av usr /usr
emerge libvpx libwebp dpkg app-arch/snappy dev-libs/re2
libvpx with use svc
libwebp with use abi_x86_32
Run these commands as root:
emerge -auD --with-bdeps=y glibc #You may need to perform a world update
[ -f /usr/lib/libwebp.so.6 ] || ln -s /usr/lib/libwebp.so.5 /usr/lib/libwebp.so.6
[ -f /usr/lib/libwebpdemux.so.2 ] || ln -s /usr/lib/libwebpdemux.so /usr/lib/libwebpdemux.so.2
chown root:root /usr/lib64/chromium-browser/chrome-sandbox
chmod 4755 /usr/lib64/chromium-browser/chrome-sandbox