In file included from libavformat/codec2.c:24:
./libavcodec/codec2utils.h:26:10: fatal error: codec2/version.h: No such file or directory
 #include 
          ^~~~~~~~~~~~~~~~~~
compilation terminated.
make: *** [ffbuild/common.mak:81: libavformat/codec2.o] Error 1
make: *** Waiting for unfinished jobs....