ghc head on windows: gcc.exe: installation problem, cannot exec `cc1': No such file or directory

[Claus Reinke]

I just pulled the latest head and tried to build, getting

cd hpc    && d:/fptools/ghc/libraries/cabal-bin c:/ghc/ghc-6.8.3/bin/ghc d:/fptools/ghc/libraries/bo
otstrapping.conf clean     --distpref=dist-bootstrapping
cleaning...
cd hpc    && d:/fptools/ghc/libraries/cabal-bin c:/ghc/ghc-6.8.3/bin/ghc d:/fptools/ghc/libraries/bo
otstrapping.conf configure --distpref=dist-bootstrapping --with-compiler=c:/ghc/ghc-6.8.3/bin/ghc --
with-hc-pkg=c:/ghc/ghc-6.8.3/bin/ghc-pkg --package-db=d:/fptools/ghc/libraries/bootstrapping.conf.tmp
Configuring hpc-0.5...
cd hpc    && d:/fptools/ghc/libraries/cabal-bin c:/ghc/ghc-6.8.3/bin/ghc d:/fptools/ghc/libraries/bo
otstrapping.conf build     --distpref=dist-bootstrapping
Preprocessing library hpc-0.5...
gcc.exe: installation problem, cannot exec `cc1': No such file or directory
compiling dist-bootstrapping\build\Trace\Hpc\Reflect_hsc_make.c failed
command was: c:\ghc\ghc-6.8.3\gcc.exe -c -D__GLASGOW_HASKELL__=608 -Ic:\ghc\ghc-6.8.3/lib\directory-
1.0.0.1\include -Ic:\ghc\ghc-6.8.3/lib\old-time-1.0.0.0\include -Ic:\ghc\ghc-6.8.3/lib\base-3.0.2.0\
include -Ic:\ghc\ghc-6.8.3/include -Ic:\ghc\ghc-6.8.3/include/mingw dist-bootstrapping\build\Trace\H
pc\Reflect_hsc_make.c -o dist-bootstrapping\build\Trace\Hpc\Reflect_hsc_make.o
make[1]: *** [bootstrapping.conf] Error 1
make[1]: Leaving directory `/cygdrive/d/fptools/ghc/libraries'
make: *** [stage1] Error 2

Since this configuration has been able to build head until recently,
I assume this is an unwanted side-effect of trying to fix cc1-issues
on newer configurations?

Claus