Correct git clone and build instructions?

[Jeff Carr]

I'm having trouble finding accurate git clone and build instructions
on the wiki. When trying to run autoconf.sh in the xserver tree it
complained of "error: must install xorg-macros". Is the best way to
just go through and clone these one by one until the dependencies are
met? I suspected it's just the beginning of a long chain of hairy
dependences that might be worthy of emailing the list first.

Is there a tool like the android "repo" or perhaps a method to pull
down the various git trees via git submodule? Or just README that
contains the recommended order of building and installing?