I just discovered that almost 2 weeks ago, the FastMM code repository added support for these defines in Mac OS X in Commit [r67].:
This is great news!
Note: this is not a full FastMM release, but since the original change by Sebastian Zierer has been done about half a year ago, the code is pretty stable.
Thanks mnasman for mentioning this on Delphi Redit, and Ralf Stocker for announcing this in the Non-Tech newsgroup.
via: FastMM / Code / Commit [r67].Filed under: Delphi, Delphi XE2, Delphi XE3, Delphi XE4, Delphi XE5, Development, FastMM, Software Development