Installing npm: segmentation fault after "sudo make install"

Im following the instructions:

git clone https://github.com/isaacs/npm.git
cd npm
sudo make install

and Im getting this:

! [ -d .git ] || git submodule update --init --recursive
node cli.js install -g -f
make: *** [install] Segmentation fault

Any idea?

I have Ubuntu 10.10 and node v0.5.6-pre

Regards

Javi