graphics/opencv2-core: compiler error on CURRENT: error: 'stddef.h' file not found

Dimitry Andric dim at
Fri Oct 7 11:27:49 UTC 2016

On 07 Oct 2016, at 10:26, O. Hartmann <ohartman at> wrote:
> I'm being haunted by this error on two CURRENT systems, while several other CURRENT
> systems with identical src.conf and make.conf are not affected, please see below.
> cd /usr/ports/graphics/opencv2-core/work/opencv- && /usr/bin/c++
> -I/usr/ports/graphics/opencv2-core/work/opencv-
> -I/usr/ports/graphics/opencv2-core/work/opencv-
> -I/usr/ports/graphics/opencv2-core/work/opencv-
> -I/usr/ports/graphics/opencv2-core/work/opencv-
> -I/usr/ports/graphics/opencv2-core/work/opencv-
> -isystem /usr/local/include/eigen3 -isystem /usr/include/include -O2 -pipe -O3
> -march=native -fstack-protector -fno-strict-aliasing   -fsigned-char -W
> -Werror=return-type -Werror=address -Werror=sequence-point -Wformat
> -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes
> -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wno-narrowing
> -Wno-delete-non-virtual-dtor -Wno-unnamed-type-template-args -Wno-array-bounds
> -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -msse -msse2 -mavx
> -mavx2 -ffunction-sections -O2 -pipe -O3 -march=native -fstack-protector
> -fno-strict-aliasing  -DNDEBUG -fPIC -o CMakeFiles/opencv_core.dir/src/arithm.cpp.o
> In file included
> from /usr/ports/graphics/opencv2-core/work/opencv-
> In file included from /usr/include/c++/v1/algorithm:624: In file included
> from /usr/include/c++/v1/initializer_list:47: /usr/include/c++/v1/cstddef:43:15: fatal
> error: 'stddef.h' file not found #include_next <stddef.h>

So for some reason, on your system, the compilation flags include
-isystem /usr/include/include, which is rather strange.  I would not
expect this to break compilation in the fashion you are seeing.  Do you
have an /usr/include/include directory on your system, by any chance?

That said, for me graphics/opencv2-core compiles just fine, and the
compilation flags only have an -isystem option to point at the
/usr/local/include/eigen3 directory.

Maybe the problem lies in the eigen3 port?  I assume this will have a
pkg-config file, or some other way at getting the required CFLAGS and
CXXFLAGS for using it.


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