--- src/cwlib/Makefile.orig	2009-07-21 06:34:13.000000000 +0000
+++ src/cwlib/Makefile	2009-07-21 06:34:39.000000000 +0000
@@ -43,11 +43,11 @@
 libcw.so.0.0.0: cwlib.o
 	if [ "$(CC_LINKS_SO)" = "yes" ]; then				\
 		$(CC) -shared -Wl,-soname,libcw.so.0			\
-			-o libcw.so.0.0.0 cwlib.o;			\
+			-o libcw.so.0.0.0 cwlib.o -lm;			\
 	else								\
 		if [ "$(LD_LINKS_SO)" = "yes" ]; then			\
 			$(LD) -G -Wl,-soname,libcw.so.0			\
-				-o libcw.so.0.0.0 cwlib.o;		\
+				-o libcw.so.0.0.0 cwlib.o -lm;		\
 		fi							\
 	fi