[users@lists.monobjc.net] Native Bundling: fatal error: 'mono/metadata/assembly.h' file not found

[Robert N]

Monobjc-6.0.2744.0.pkg
Monoobjc.Tools = 5.0.0.0 (via About box/ Show assemblies)
Monoobjc Development = 5.0.2678.21 (Via Add-in Manager)
Xcode = Version 6.1.1 (6A2008a)
OS-X 10.10.2 / Darwin Kernel Version 14.1.0


When bundling to 'native' any sample produces a fatal error:

fatal error: 'mono/metadata/assembly.h' file not found

Do I need to provide the location of the Mono source tree/SDK somewhere? 

I have a standard Mono MDK (3.12.0) installed in the normal/standard mono 
framework directory (also have full source and can (do) compile mono from git 
source for a custom mcs compiler version but that is not in use in this 
environment).

Thanks, -R

Complete compile output:

<a 
href="https&#58;&#47;&#47;gist.github.com&#47;sushihangover&#47;e26c444e32753ccc3d5e"
 target="_blank" 
class="newlyinsertedlink">https&#58;&#47;&#47;gist.github.com&#47;sushihangover&#47;e26c444e32753ccc3d5e</a>


Xamarin Studio
Version 5.0.1 (build 3)
Runtime:
        Mono 3.12.0 ((detached/a813491)
        GTK+ 2.24.23 (Raleigh theme)
        Package version: 312000068