I'm trying to install the official c5 github develop branch on Windows 7. The git bit works, but the subsequent 'composer install' dies:

"Failed to download ocramius/proxy-manager from dist: The archive may contain identical file names with different capitalization (which fails on case insensitive filesystems)"

I've updated composer and cleared its cache, to no avail.

(I know I can install in other ways, but I'd rather have a git installation so I can make push requests.)

Any tips?