autoconf issue using -stdc=gnu++0x option in AC_CHECK_HEADER macro.

[Jochen Schmitt]

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Hello,

I have a special question about the AC_HEADER macro in autoconf. I'm
trying to text for
the existence of the unordered_set header file in C++. Unfortunately,
I will got a message,
that I have to use the -std=gnu++0x if I want to include this header file.

So I want to ask, what I have to to, that autoconf will respect this
option in the
AC_HEADER macro.

Best Regards:
Jochen Schmitt
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