[Bug c/51597] math libraryb not works

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51597

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-12-18 
15:05:59 UTC ---
(In reply to comment #0)
> :~$gcc -lm rf.c

try gcc rf.c -lm