/home/kyle/software/ffmpeg/source/ffmpeg-git/libavdevice/decklink_common.cpp: In function 'char* dup_wchar_to_utf8(wchar_t*)':
/home/kyle/software/ffmpeg/source/ffmpeg-git/libavdevice/decklink_common.cpp:61:42: error: 'char* dup_wchar_to_utf8(wchar_t*)' was declared 'extern' and later 'static' [-fpermissive]
 static char *dup_wchar_to_utf8(wchar_t *w)
                                          ^