Problem building HEAD when a newer version of Cabal is installed

I get the following error when building HEAD. I'm using the release candidate ghc-6.10.0.20081007 from the OS X installer as the bootstrapping compiler.

This seems odd since the Cabal I have in my build tree is 1.5.5; version 1.6.0.0 is installed for the bootstrapping compiler, but IIRC stage1 is supposed to be built using libraries/Cabal instead of the installed version.

Configuring ghc-bin-6.11.20081011...
/Users/judah/Programming/dontbackup/ghc-unvalidated/libraries/cabal-bin /usr/bin/ghc /Users/judah/Programming/dontbackup/ghc-unvalidated/libraries/bootstrapping.conf build     --distpref dist-stage1 --ghc-option=-H64m --ghc-option=-O0 --ghc-option=-fasm  --ghc-option=-H64m  --ghc-option=-O0  --ghc-option=-fasm 
Preprocessing executables for ghc-bin-6.11.20081011...
Building ghc-bin-6.11.20081011...
[1 of 1] Compiling Main             ( Main.hs, dist-stage1/build/ghc/ghc-tmp/Main.o )
Linking dist-stage1/build/ghc/ghc ...
/Users/judah/Programming/dontbackup/ghc-unvalidated/utils/installPackage/install-inplace/bin/installPackage install '/Users/judah/Programming/dontbackup/ghc-unvalidated/utils/ghc-pkg/install-inplace/bin/ghc-pkg' 'XXX/package.conf' "" \
	                   /Users/judah/Programming/dontbackup/ghc-unvalidated/ghc/stage1-inplace          \
	                   /Users/judah/Programming/dontbackup/ghc-unvalidated/ghc/stage1-inplace          \
	                   '$prefix'                                      \
	                   '/Users/judah/Programming/dontbackup/ghc-unvalidated/inplace-datadir'                           \
	                   '$prefix/libexec'                              \
	                   '$prefix/dynlib'                               \
	                   '/Users/judah/Programming/dontbackup/ghc-unvalidated/inplace-datadir'                           \
	                   '$prefix/doc'                                  \
	                   '$prefix/html'                                 \
	                   '$prefix/haddock'                              \
	                   --distpref dist-stage1                         \
	                   --disable-executable-stripping                        \
	                   --enable-shell-wrappers
installPackage: You need to re-run the 'configure' command. The version of
Cabal being used has changed (was Cabal-1.5.5, now Cabal-1.6.0.0).
make[2]: *** [build.stage.1] Error 1
make[1]: *** [build.stage.1] Error 2
make: *** [stage1] Error 1

Trac metadata

Trac field	Value
Version	6.11
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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