Whatever is supposed to update the FAAD_VERSION define is not working and the neeaccdec.h ends up installed with the following line:
#define FAAD2_VERSION "unknown"
This breaks things, such as libquicktime, which attempt to parse the define as "%d.%d".
First noticed with 2.8.6, I still see this being a problem in 2.8.8
It's not supposed to be updated anymore, for the correct way to get version string see recent frontend/main.c