Analyse following RPM build log snippet. Describe contents accurately, without speculation or suggestions for resolution.            
Your analysis must be as concise as possible, while keeping relevant information intact.
Snippet: 
sdl.c:57:1: note: include â<math.h>â or provide a declaration of âfabsfâ
   56 | #include "sdl.h"
  +++ |+#include <math.h>
   57 | 
This is compiler note. Header file `math.h` should be included in the `sdl.c` file.