This is being worked on, please maintain your patience. I have successfully done this before but I don't remember what I did, so I will have to recreate a lot of stuff.
- a mind so deadset on cross-compiling you won't stop to think
- the Xcode .dmg for your target OS X version
- root access to your build system
- a good processor and a lot of RAM
I used Ubuntu 14.04 "Trusty Tahr" for doing the initial chroot. The process was as follows:
apt-get install dchroot debootstrap
Then edit /etc/schroot/schroot.conf with your favourite text editor, and add this at the end:
[trusty] description=Ubuntu Trusty location=/var/chroot priority=3 users=your_username groups=sbuild root-groups=root
Install a base system:
sudo debootstrap --variant=buildd --arch amd64 trusty /var/chroot/ http://mirror.url.com/ubuntu/
Now copy your resolv.conf for internet access (required):
sudo cp /etc/resolv.conf /var/chroot/etc/resolv.conf
Finally, chroot into your target:
sudo chroot /var/chroot
You should now have a working chroot, free for you to destroy as you see fit.