[Libreoffice] ./download doesn't work behind a proxy

I'm trying to build LibreOffice, but already have problems during source 
download.

./download just hangs with the following output:
Downloading files for libreoffice-3.2.99.2
* cloning from git://anongit.freedesktop.org/git/libreoffice/artwork
Cloning into artwork...

Setting http_proxy doesn't help (since git:// is used and not http://).

When changing the script manually to use http:// instead of git://, I 
get the following error:
Downloading files for libreoffice-3.2.99.2
* cloning from http://anongit.freedesktop.org/git/libreoffice/artwork
Cloning into artwork...
fatal: http://anongit.freedesktop.org/git/libreoffice/artwork/info/refs 
not found: did you run git update-server-info on the server?

When changing the script to clone from 
http://anongit.freedesktop.org/git/libreoffice/artwork.git, the download 
works but the destination then is wrong:
Downloading files for libreoffice-3.2.99.2
* cloning from http://anongit.freedesktop.org/git/libreoffice/artwork.git
Cloning into artwork...
sh: line 0: cd: /tmp/LO/libreoffice-build-3.2.99.2/clone/artwork.git: No 
such file or directory

Any ideas on how to get the ./download script working with http clone?

Thanks, Oli

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