http://bugs.gentoo.org/330255

liblvm2app.so: undefined reference to `floor'

--- liblvm/Makefile.in
+++ liblvm/Makefile.in
@@ -39,7 +39,7 @@
 
 include $(top_builddir)/make.tmpl
 
-LIBS += $(LVMINTERNAL_LIBS) -ldevmapper
+LIBS += $(LVMINTERNAL_LIBS) -ldevmapper -lm
 
 ifeq ("@DMEVENTD@", "yes")
   LIBS += -ldevmapper-event