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I'm using Rio, Firemonkey and have a c++ app that builds and runs on win32 and win64. When I try to build for osx, I get [xlink.exe Error] Fatal: Error detected (REA2866)
I have the same problem, did you found out why??? I get this on a new project when running on mac with "link with runtime packages"
I don't remember how I fixed it. Check both the "build" and "output" tabs in the "messages" window for clues. I'm currently using Rio 10.3.2 and haven't seen that error again.