From: Avi Kivity <a...@redhat.com>

Signed-off-by: Avi Kivity <a...@redhat.com>

diff --git a/Makefile b/Makefile
index 6739626..9ce52aa 100644
--- a/Makefile
+++ b/Makefile
@@ -367,3 +367,14 @@ tarbin:
 
 # Include automatically generated dependency files
 -include $(wildcard *.d audio/*.d slirp/*.d)
+
+.PHONY: kvm/extboot
+
+all: kvm/extboot
+
+kvm/extboot:
+       $(MAKE) -C $@
+       if ! [ -f pc-bios/extboot.bin ] \
+           || ! cmp -s pc-bios/extboot.bin $@/extboot.bin; then \
+               cp $@/extboot.bin pc-bios/extboot.bin; \
+       fi
--
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