diff -p -up ./src/Makefile.am.orig ./src/Makefile.am
--- ./src/Makefile.am.orig	2012-03-05 18:31:55.668032286 +0000
+++ ./src/Makefile.am	2012-03-05 18:32:13.368518650 +0000
@@ -105,7 +106,8 @@ libdevhelp_3_la_CFLAGS =				\
 
 libdevhelp_3_la_LIBADD =				\
 	$(LIBDEVHELP_LIBS)				\
-	$(ZLIB_LIBS)
+	$(ZLIB_LIBS)					\
+	-lm
 
 libdevhelp_3_la_LDFLAGS =				\
 	-no-undefined					\