make install fails with the head version of GHC

I get the latest sources using the following commands and build them.

./darcs-all pull -av
perl boot
./configure --prefix=/tmp/ghc-6.13.0
make

However while doing 'make install', i get the following error message.

...
for i in utils/haddock/html/*; do \
	    /usr/bin/install -c -m 644  $i "/tmp/ghc-6.13.0/lib/ghc-6.13.20100810/html"; \
	done
/usr/bin/install: omitting directory `utils/haddock/html/Classic.theme'
/usr/bin/install: omitting directory `utils/haddock/html/Ocean.std-theme'
/usr/bin/install: omitting directory `utils/haddock/html/Snappy.theme'
make[1]: *** [install_utils/haddock_data] Error 1
make: *** [install] Error 2