This toolchain was built using crosstool-ng version 1.9.3:

  http://crosstool-ng.org/

As well as patches from the QCA setup as outlined here:

  https://drive.google.com/a/google.com/file/d/0BxCLRDWW7YPXQW5yd3dzQmFQamhSX3FrUmtQajdHaXBmaTY4/view?usp=sharing

The patches included were for the following packages:

  -- linux-2.6.31 headers
  -- gcc 4.6.4
  -- uClibc 0.9.33.2
  -- binutils 2.24

The uClibc also included a config file modified to contain build instructions
for support of:

  -- WCHAR
  -- RPC
  -- IPV6
  -- PTHREADS (w/ debugging.  NPTL impl)

Some patches had to be made to the base installation of crosstool-ng, namely the
inclusion of a proper PATH variable in order not to use the default host
compiler (default must be version 4.6 or older, as 4.8+ has several deprecated
options that make crosstool-ng unable to function) when compiling uClibc.

Then the main script file was patched so that, on an Ubuntu-14.04 installation,
a working version of gcc was used when copying the host compiler into the
crosstool build directory (instead of running `which gcc' it instead runs
`which gcc-4.6' to locate the gcc path).

After all this, crosstool was run to build the config included in build/config
(albeit with proper paths to conform to the paths on the respective host machine for
linux headers and such).