[Bug 211808] graphics/opencv-core: c++ compiler error due to "fatal error: 'stddef.h' file not found"

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=211808

ohartman at zedat.fu-berlin.de changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|Affects Many People         |Affects Some People
              Flags|                            |maintainer-feedback+

--- Comment #3 from ohartman at zedat.fu-berlin.de ---
The problem still persists on one box and drives me nuts.

It seems the compiler doesn't find its standard includes - or gets confused by
accidentally found remanants of previous, non-cleaned installations. I tried to
rebuild opencv-core with "portmaster -d" option to build everything, but it
doesn't help much.

Running an update of port graphics/opencv-core on most recent ports tree
(r423107) on a 12-CURRENT (FreeBSD 12.0-CURRENT #30 r306561: Sat Oct  1
23:55:43 CEST 2016), results in a compilation error shown below. The port has
been successfully installed when CURRENT was 11-CURRENT and updated as it has
been required by port changes (compiled from sources!).

In /etc/src.conf, I use these lines reflcting compilation of the OS sources:
#
CPUTYPE?=               native
#
CFLAGS+=                -O3
# for the kernel
COPTFLAGS+=             -O3
#
#CXXFLAGS+=             -std=c++11
#
WITH_CLANG_EXTRAS=      YES
WITH_CLANG_FULL=        YES
WITH_LLDB=              YES
[...]

and  I use in /etc/make.conf also apart from the standard/vanilla parameters:

[...]
CPUTYPE?=native
CFLAGS+=-O3
COPTFLAGS+=-O3
[...]

The error while compilation is then shown as

[...]
/usr/include/c++/v1/cstddef:43:15: fatal error: 'stddef.h' file not found

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