I am mainly looking for a confirmation that other people are able to build 1.7x on Leopard without problems before I submit this as a bug.
Though, if you know the solution to this problem, don't be shy to let me know.
I don't think that is necessary. It certainly wasn't in previous versions, and I didn't see any mention of such changes in change log so I guess it shouldn't be required in 1.7x either.
I'm trying to find out if anyone is able to build from source just by opening Xcode project and hitting build. That's how I used to build 1.5x and 1.6x before. And, I guess, that is how 1.7x is supposed to be built. Can any Transmission developers confirm that?