I mostly develop on Linux and meld is indispensable for me. However, when I'm on the road I use a MacBook (leopard) and I want to use the same set of tools as on my main development box, meld being one of them.
Although you shoud be able to install meld, I could not succeed with it. So... are there any alternatives that are as good (or better) as meld?
One thing to point out, I use subversion and I just love the 'meld .' command that diffs my working directory to the BASE revision...
Johan
Have you tried http://meld.darwinports.com/?
If you post some of the troubles you're having getting Meld working on OS X then we could help you out? :o)
Apple's FileMerge (which is included in their Developer Tools download) looks similar to Meld, though I confess to not having used either..
Take a look at Changes.app. Yes, it is for pay, but it's very capable, fast, easy on the eyes. It also has a command line tool. Take a look at the wiki for tips and tricks, especially with getting it to integrate with version control systems. I love Changes.app.
Sourcegear DiffMerge is free and completely cross-platform (Windows, Mac and Linux). I've only used the Windows version, and it lacks some more advanced features (like syntax highlighting and opening .diff files) but I'm very happy with it.
KDiff is cross platform, open source, and has an OSX binary available.