Sorry, my post wasn't too clear - what I should have said was that dpkg claimed it was unable to find an installation candiate for libmad0. This is strange, since I found it without any issue using Google (it's in Extras, which I have set up as a repository - oh well); I just downloaded it from maemo.org and installed it manually).

Done this now I'm awake and caffeinated, and ScummVM installed fine, appearing under the Games category (Catorise). Loads up nicely and I get the main ScummVM screen OK.

Now I just need to get a game and give it a try - as I'm at work right now that'll have to wait 'til this evening.

Thanks again for your hard work on this! It's been almost half a lifetime since I played DoTT and it was an old(ish) game even then, but great stuff.

Edit: as usual, life intervened and I didn't have time yesterday, but I'm still planning to get a game and test!