Here's a test build from sources synced this morning. I believe it to be an i386/x64 universal binary that works on Mac OSX 10.5 and up - Mac users feel free to test.
https://dl.dropboxusercontent.com/u/669647/Hatari.app.zip
(ST build)
I have not tried building for SDL2. The only "upgrade" that was needed compared to how I built v1.8.0 was to include a newer version of libpng.
Trivia: The CAPSImage 5..0 developer framework available at
http://www.softpres.org/download is not compiled for i386/x64 but for PPC/i386. I've thus used the same framework as Nicolas mailed this list when I made v1.8.0.
Question: In the compilation directory I get a libFloppy.a when building. I'm unsure what to do with that :)
/Troed