GCC 4.8.4 wchar error blocking devel/kBuild (virtualbox-ose dependency)

[Tijl Coosemans]

On Fri, 06 Mar 2015 12:16:09 -0700 Scott Furry <scott.wl.furry at gmail.com> wrote:
> On 06/03/2015 03:35, Tijl Coosemans wrote:
>> On Thu, 05 Mar 2015 13:20:25 -0700 Scott Furry <scott.wl.furry at gmail.com> wrote:
>>> Originally sent to vbox at FreeBSD.org this morning:
>>> On 05/03/2015 07:52, Scott Furry wrote:
>>>> While attempting to build emulators/virtualbox-ose(4.3.24) from
>>>> FreeBSD ports, I keep running into a error during the build of
>>>> devel/kBuild(0.1.9998).
>>>> Error stops the build, but it seems a strange error being unable to
>>>> determine a '__wchar_t' type.
>>> emulators/virtualbox-ose-kmod (4.3.24) and emulators/virtualbox-ose
>>> (4.3.24) are still blocked by error given above.
>>>
>>> I may not be the only one affected here. A quick google search dug up
>>> this thread:
>>> https://gist.github.com/tangentstorm/af2c97d89e194b3356c3
>>>
>>> User indicated exact same error using gcc4.8.4 build.
>> Try rebuilding gcc.  During installation gcc thinks it's a good idea to
>> fix "bugs" in some system headers by copying them to an obscure directory
>> and then using those "fixed" copies instead of the real headers.
>> When these system headers are updated gcc has an outdated copy that
>> can cause errors in other headers.  So, to be safe, whenever you update
>> the base system you also have to rebuild the gcc ports.
> Tried your suggestion. I went to update ports. I explicitly did an 
> update to lang/gcc48 before ports updating. This brought gcc48 up to 
> version 4.8.5-20150212. However, the original error message is 
> persistent. It appears that kBuild is using the gcc-4.8.4 files (or is 
> hardcoded to use these files) from somewhere else but not the installed 
> version.
> 
> Error not resolved.
> 
> Thanks for trying.

What is the output of:
grep __wchar_t /usr/local/lib/gcc48/gcc/x86_64-portbld-freebsd10.0/4.8.5/include-fixed/wchar.h