On running gcc aac.c -L. -lfaad -lm -o aacfixer, to fix the audio, I got the error message aac.c:88:15: warning: implicit declaration of function ‘time’ [-Wimplicit-function-declaration]
This was fixed by editing the aac.c file and adding a line for #include <time.h> to the includes (near the top of the file).

I also go the error aac.c:118:8: warning: type defaults to ‘int’ in declaration of ‘uid’ [-Wimplicit-int]
It seems to be the line static uid=0; should be static int uid=0;