--- a/Makefile.rules.old	2011-06-10 14:14:08.372105234 +0200
+++ b/Makefile.rules	2011-06-10 14:14:18.504746649 +0200
@@ -1,6 +1,6 @@
 
 SDL_CONFIG=sdl-config
-LIBS=`$(SDL_CONFIG) --libs` -mno-windows -mcygwin -lz -l$(OPENGL)
+LIBS=`$(SDL_CONFIG) --libs` -mno-windows -mcygwin -lz -l$(OPENGL) -lm
 
 PROFLAGS=-g -Wall -pg -fprofile-arcs -ftest-coverage
 OPTFLAGS=-O3 -fno-strict-aliasing -fomit-frame-pointer -ffast-math -march=$(CPU) $(OPTIMIZE)