Index: libeweather/src/lib/Makefile.am
===================================================================
--- libeweather.orig/src/lib/Makefile.am
+++ libeweather/src/lib/Makefile.am
@@ -30,6 +30,7 @@ eweather_smart.c
 
 libeweather_la_DEPENDENCIES = $(top_builddir)/config.h
 libeweather_la_LDFLAGS = @E_LIBS@
+libeweather_la_LIBADD = -lm
 
 clean-local:
 	@rm -rf *.gcno