_XOPEN_SOURCE      30 doc/examples/filtering_video.c #define _XOPEN_SOURCE 600 /* for usleep */
_XOPEN_SOURCE      76 libavcodec/crystalhd.c #define _XOPEN_SOURCE 600
_XOPEN_SOURCE      20 libavutil/error.c #define _XOPEN_SOURCE 600 /* XSI-compliant version of strerror_r */
_XOPEN_SOURCE      27 libavutil/mem.c #define _XOPEN_SOURCE 600