--- tools/qemu-xen/Makefile.target.orig	2013-06-04 15:51:15.320999319 +0200
+++ tools/qemu-xen/Makefile.target	2013-06-04 15:51:37.360864318 +0200
@@ -205,7 +205,7 @@ obj-$(CONFIG_REALLY_VIRTFS) += 9pfs/virt
 obj-$(CONFIG_KVM) += kvm.o kvm-all.o
 obj-$(CONFIG_NO_KVM) += kvm-stub.o
 obj-y += memory.o
-LIBS+=-lz
+LIBS+=-lz -lrt
 
 QEMU_CFLAGS += $(VNC_TLS_CFLAGS)
 QEMU_CFLAGS += $(VNC_SASL_CFLAGS)
--- tools/qemu-xen-traditional/Makefile.target
+++ tools/qemu-xen-traditional/Makefile.target
@@ -520,7 +520,7 @@
 OBJS+=block-raw-posix.o
 endif
 
-LIBS+=-lz
+LIBS+=-lz -lm -lrt
 ifdef CONFIG_ALSA
 LIBS += -lasound
 endif