_XOPEN_SOURCE 30 doc/examples/filtering_video.c #define _XOPEN_SOURCE 600 /* for usleep */ _XOPEN_SOURCE 48 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