graphics/opencv: on CURRENT (r255472): c++ issue resulting in: error: use of undeclared identifier 'usleep' usleep(1000); ^ 1 error

[O. Hartmann]

Recompiling everything installed due to the iconv-issue and the
extraction of the GNUish libstdc++ in favor of the new libc++, I run
permanently into the problem of a compiler (c++) stopp at
graphics/opencv due to the error shown below.

I'm getting crazy here, since I have successfully compiled opencv on
two other boxes running the most recent CURRENT with no libstdc++ and
no converters/libiconv any more.

Doing 

portmaster -f graphics/opencv

results in getting everything built, except graphics/opencv!

graphics/opencv seems to be a prerequisite for the build of
devel/kdevelop-kde4, which also is a stopgap at the moment and is very
resiliant in getting compiled.

Can someone shed light and hints onto this?

Thanks in advance,
Oliver


[...]
/usr/local/include/libavformat/avformat.h:1578:26: note:
'av_write_header' declared here attribute_deprecated int
av_write_header(AVFormatContext *s); ^
12 warnings generated.
[  2%] Building CXX object
modules/highgui/CMakeFiles/opencv_highgui.dir/src/loadsave.o [  2%]
Building CXX object
modules/highgui/CMakeFiles/opencv_highgui.dir/src/precomp.o [  2%]
Building CXX object
modules/highgui/CMakeFiles/opencv_highgui.dir/src/utils.o [  3%]
Building CXX object
modules/highgui/CMakeFiles/opencv_highgui.dir/src/window.o [  3%]
Building CXX object
modules/highgui/CMakeFiles/opencv_highgui.dir/src/window_QT.o /usr/ports/graphics/opencv/work/OpenCV-2.3.1/modules/highgui/src/window_QT.cpp:316:5:
error: use of undeclared identifier 'usleep' usleep(1000); ^ 1 error
generated. *** Error code 1
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