Are these dir names correct ?

No, they're not. I'm not convinced that this file is necessary since we build on the bots with this as it is. This whole .deb configuration is a bit of a hack right now. I'm using helper tools that seem to want special-snowflake configuration. Right now we just copy this directory over. This is definitely not the right way to do it, but it works. Most of my attention was on getting llvm itself working on linux. I put this up here to ask @directhex what route he thinks I should take to make this configuration step more sane.

This line is where you specify which packages are required to build - for example, the upstream LLVM 3.9 package's build depends are here: http://sources.debian.net/src/llvm-toolchain-snapshot/1:3.9~svn274438-1/debian/control/#L6-L11

If you specify this correctly, you can generate a "good" source package which can be passed through to the chroot package builder, which makes building on multiple architectures WAY easier.

As in debian/compat note, this should be lowered to debhelper (>= 7.0.50~) for now.