lang/gcc6, lgamma1(), _GLIBCXX_USE_C99_MATH_TR1 and "'round' is not a member of 'std'"

To: tech-pkg%netbsd.org@localhost
Subject: lang/gcc6, lgamma1(), _GLIBCXX_USE_C99_MATH_TR1 and "'round' is not a member of 'std'"
From: Edgar Fuß <ef%math.uni-bonn.de@localhost>
Date: Mon, 3 Sep 2018 17:59:29 +0200

I am building 2018Q2 using lang/gcc6 (GCC 6.4.0).
I got "'round' is not a member of 'std'".
I found out this is because bits/c++config.h doesn't define 
_GLIBCXX_USE_C99_MATH_TR1.
According to a freebsd thread 
(https://lists.freebsd.org/pipermail/freebsd-current/2014-January/048130.html) 
GCC does this if libm doesn't contain lgamma1 etc.
So, while I'm on 6.1, it looks like no NetBSD's libm contains lgamma1.
Is this true? If no, what do I overlook? If yes, how to resolve it?

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