--- pidgin-2.14.0/pidgin/Makefile.am
+++ pidgin-2.14.0/pidgin/Makefile.am
@@ -162,7 +162,7 @@
 	$(LIBXML_LIBS) \
 	$(GTK_LIBS) \
 	$(GIO_UNIX_LIBS) \
-	$(top_builddir)/libpurple/libpurple.la
+	$(top_builddir)/libpurple/libpurple.la -lm
 
 AM_CPPFLAGS = \
 	-DDATADIR=\"$(datadir)\" \