Go directly to the builds.

If you feel the need to roll your own, please read through the following pages. They might be slightly outdated, but they have everything you need.

export MOZ_PHOENIX=1
mk_add_options MOZ_PHOENIX=1
ac_add_options --enable-crypto
ac_add_options --disable-tests
ac_add_options --disable-debug
ac_add_options --disable-mailnews
ac_add_options --disable-composer
ac_add_options --enable-strip
ac_add_options --enable-strip-libs
ac_add_options --enable-optimize="-O2 -march=i686"
ac_add_options --enable-xft

mkdir phoenix-source && cd phoenix-source

wget http://ftp.mozilla.org/pub/mozilla/nightly/latest/mozilla-source.tar.bz2

tar xvjf ./mozilla-source.tar.bz2

(Optional) Set your CVSROOT environment variable per http://mozilla.org/cvs.html

cvs -d :pserver:anonymous@cvs-mirror.mozilla.org:/cvsroot checkout mozilla/browser mozilla/toolkit

vi mozilla/.mozconfig

cd mozilla && gmake -f client.mk build

How do I build Epiphany?
Make sure you have a prerequisite version of Mozilla and use --prefix=/usr

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