I still have Mac on VMWare I could compile MCServer there if you want.
Although it's stuck on the loading screen for a while now :S
For people who want to run the latest version of MCServer on Mac (I completely agree that it should be able to run natively), for the time being you can use WINE. I tried using WINE to run MCServer and it ran flawlessly, so if Mac users want to run the latest version right now, you should use WINE.
I can confirm that builds work on Mac, out of the box. I didn't test xcodebuild, but the Makefile version worked without error. Build for commit e7708d483eee57fbdd457f566a97315a72fa09e3:
https://files.fluidnode.com/public/MCServer.zip
Compiled on OS X Yosemite with Xcode command line tools. Would it be possible to cross compile this on Linux?