Help with making a port C11 compliant

Montgomery-Smith, Stephen stephen at
Fri May 6 16:18:06 UTC 2016

Here is my problem:

the configure script says:
configure: error: Standard ISO C++ headers are missing

In the Makefile I have the line:
USES=           compiler:c++11-lang

Is there anything else I need to do?  I should add that seems to be a
FreeBSD-9 only problem - it builds fine on FreeBSD-10 and higher.

Thanks, Stephen

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