Yes, it's been a while since that code has been under active development. My understanding is that the move to Qt Mobile Hotspot happened around the same time Nokia was switching everything over to the Qt system, so Qt Mobile Hotspot should be the more up-to-date package (as peterleinchen mentioned).

I am unsure what SDK was used by the original developers of this product; but in general, whenever you attempt to work on a large codebase created by someone else, I think you'll find that some adaptation to your local environment will be required. But luckily, several SDKs are still around! You can, for example, still find the Qt SDKs supporting Maemo at this site:

ftp://ftp.informatik.hu-berlin.de/pu...l.no/QT/qtsdk/

The best version to choose is 1.1.1, as that was the last version to include the full Maemo toolchain in the installer. There are versions of the SDK for Linux, Mac, and Windows operating systems; also, there are "online" and "offline" versions, but the "online" versions no longer work (as Nokia's servers are gone now). So, for example, if you want the Windows version of the SDK, the file to download would be:

Qt_SDK_Win_offline_v1_1_1_en.exe

An even easier solution (although I haven't yet downloaded a copy myself, shame on me) could be to try out the new live CD containing SDKs for a wide range of Nokia devices (including the N900), created by TMO member endsormeans. You can find info about it in this thread:

http://talk.maemo.org/showthread.php?p=1472078

Luckily, the source code for everything in the Extras repository is available. If you navigate to the page describing a particular instance of a package, such as version 0.3.5 of Qt Mobile Hotspot:

http://maemo.org/packages/package_in...hotspot/0.3.5/

you will find a variety of links including one labeled "Source:". From that link, you'll reach another page:

http://maemo.org/packages/source/vie...hotspot/0.3.5/

which contains more links, including a link to the ".tar.gz" archive containing the actual source code.