Install from latest master is broken.

[inadarei]

This was tested on Debian Lenny.

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

Results in following error:

node cli.js install -g -f
/usr/local/bin/npm -> /usr/local/lib/node_modules/npm/bin/npm.js
npm ERR! TypeError: Cannot read property 'children' of undefined
npm ERR!     at /usr/local/src/npm/lib/install.js:265:21
npm ERR!     at Array.reduce (native)
npm ERR!     at treeify (/usr/local/src/npm/lib/install.js:258:33)
npm ERR!     at cb (/usr/local/src/npm/lib/install.js:156:16)
npm ERR!     at cb (/usr/local/src/npm/lib/utils/async-map.js:51:11)
npm ERR!     at /usr/local/src/npm/lib/install.js:436:9
npm ERR!     at cb (/usr/local/src/npm/lib/utils/chain.js:35:14)
npm ERR!     at cb (/usr/local/src/npm/lib/install.js:518:21)
npm ERR!     at /usr/local/src/npm/lib/install.js:555:52
npm ERR!     at cb (/usr/local/src/npm/lib/utils/chain.js:35:14)
npm ERR! Report this *entire* log at:
npm ERR!     <http://github.com/isaacs/npm/issues>
npm ERR! or email it to:
npm ERR!     <npm-@googlegroups.com>
npm ERR! 
npm ERR! System Linux 2.6.26-2-686
npm ERR! command "node" "/usr/local/src/npm/cli.js" "install" "-g" "-f"
npm ERR! 
npm ERR! Additional logging details can be found in:
npm ERR!     /usr/local/src/npm/npm-debug.log
npm not ok
make: *** [install] Error 1

However if I do this:

$ sudo git checkout origin/1.0
M   node_modules/semver
$ sudo make install

installation completes successfully.

I noticed that node_modules/semver sub-module was upgraded yesterday, so wondering if that might have broken something?