diff -Nru orig/scripts/Makefile.modpost new/scripts/Makefile.modpost
--- orig/scripts/Makefile.modpost	2010-10-27 16:41:01.000000000 +0200
+++ new/scripts/Makefile.modpost	2010-10-27 17:23:22.000000000 +0200
@@ -72,7 +72,8 @@
 
 # Step 2), invoke modpost
 #  Includes step 3,4
-modpost = scripts/mod/modpost                    \
+tooltree = $(shell if [ -e $(objtree)/scripts/mod/modpost ]; then echo $(objtree); else echo $(srctree); fi)
+modpost = $(tooltree)/scripts/mod/modpost        \
  $(if $(CONFIG_MODVERSIONS),-m)                  \
  $(if $(CONFIG_MODULE_SRCVERSION_ALL),-a,)       \
  $(if $(KBUILD_EXTMOD),-i,-o) $(kernelsymfile)   \