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diff --git a/rules/extra-packages.mk b/rules/extra-packages.mk
new file mode 100644
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--- /dev/null
+++ b/rules/extra-packages.mk
@@ -0,0 +1,29 @@
+# -----------------------------------------------------------------------------
+#
+# (c) 2010 The University of Glasgow
+#
+# This file is part of the GHC build system.
+#
+# To understand how the build system works and how to modify it, see
+#      http://hackage.haskell.org/trac/ghc/wiki/Building/Architecture
+#      http://hackage.haskell.org/trac/ghc/wiki/Building/Modifying
+#
+# -----------------------------------------------------------------------------
+
+define extra-packages
+$$(foreach p,$$(patsubst libraries/%,%,$$(wildcard $$(shell grep '^[^ ]\+ \+\(dph\|extra\) \+[^ ]\+ \+[^ ]\+ \+[^ ]\+' packages | sed 's/ .*//'))),\
+    $$(eval BUILD_DIRS += libraries/$$p)\
+    $$(if $$(wildcard libraries/$$p/ghc-packages),\
+        $$(foreach q,$$(shell cat libraries/$$p/ghc-packages2),$$(eval $$(call extra-package,$$p,$$p/$$q))),\
+        $$(eval $$(call extra-package,$$p,$$p)))\
+)
+endef
+
+define extra-package # $1 = package root, $2 = package
+ifeq "$(wildcard libraries/$1/ghc-stage2-package)" ""
+$$(eval $$(call addPackage,$2))
+else
+$$(eval $$(call addPackage2,$2))
+endif
+endef
+