https://webrtc.googlesource.com/src/+/02400a3e5a54aceee28fc8ed0b7a35e1c3984df3/modules/video_coding/codecs/interface/libvpx_interface.cc
modules/video_coding/codecs/interface/libvpx_interface.cc - src - Git at Google
video codingmodulescodecsinterfacelibvpx
https://lists.macports.org/pipermail/macports-tickets/2015-June/187564.html
[MacPorts] #47934: libvpx should be in depends_build not depends_lib
should bemacportslibvpxdependsbuild
https://chromium.googlesource.com/webm/libvpx/+/f662898c395f824058c997885c66c2c4c5e6e69c/warnings.h
warnings.h - webm/libvpx - Git at Google
warningswebmlibvpxgitgoogle