Hi Ben,
I don't know...
The original issue was failing builds in LLP64 branch (like https://travis-ci.org/OpenSmalltalk/opensmalltalk-vm/builds/150687436).
Build were failing because vmCallback.h uses sqIntptr_t.
Since this file is only used in *abicc.c, it's enough to just invert the order of include files so that sqIntptr_t is already defined.

What about ppc?
- it does not include vmCallback.h (are callback suppported on ppc?)
- there is no ppc automated build set on travis/appveyor
- I can't test it myself

So I don't think there's an LLP64 related issue.
The issue is more about the fact that ppc support will be roting fast in those conditions.

2016-08-09 1:39 GMT+02:00 Ben Coman <btc@openinworld.com>:

On Tue, Aug 9, 2016 at 4:52 AM, GitHub <noreply@github.com> wrote:
>   Log Message:
>   -----------
>   Authorize usage of Squeak types in vmCallback
>
> For example, vmCallback might rely on sqIntptr_t for LLP64 compatibility.
> The order of include files must be revised in order to do so
> This change has been applied to ia32abicc.c cf. https://github.com/OpenSmalltalk/opensmalltalk-vm/commit/336c3d5ba394eb2812db7cee5320ce8c03f6112c (336c3d5)

> It must also be applied to other supported ABI (arm32, x64)
> Note sure what is needed for ppc32abicc...

For those platforms you don't get to straight away, could you open an
Issue on github to track?
cheers -ben