diff -up keen/src/Makefile.noSDLmain keen/src/Makefile
--- keen/src/Makefile.noSDLmain	2012-09-07 15:48:18.645302133 -0400
+++ keen/src/Makefile	2012-09-07 15:48:27.746305283 -0400
@@ -36,7 +36,7 @@ keen:  main.o sanity.o game.o gamedo.o \
 	 ai/autoray.o ai/gotpoints.o sdl/keydrv.o sdl/snddrv.o sdl/timedrv.o \
 	 sdl/viddrv.o scale2x/scalebit.o scale2x/scale2x.o scale2x/scale3x.o scale2x/pixel.o \
 	 platform.o \
-	 -lSDL -lSDLmain -lstdc++
+	 -lSDL -lstdc++ -lm
 
 main.o:	main.c main.fdh keen.h osparam.h \
 		sounds.h latch.h game.h \