Compatibility layer for Mac apps?

[Gryphus One]

Hi, I'm asking this question in this Linux Mint forum but I could do it in the forum of any other distro or in a Linux general one.
The thing is: you know there is Wine, a compatibility layer to attempt to execute Windows' programs in Unix based operating systems, like Linux, FreeBSD and Mac OS X.
But my question is: why does nobody make a compatibility layer to execute Mac's programs on Linux? it should be much easier than Wine, since unlike Windows, both Mac OS X and Linux are based on Unix. And this is true to the point that Mac OS X is said to be able to execute Linux programs, so it should be possible to do the other way round without a great effort...

Can anyone explain me this, please?

Thanks.

[Husse]

Even if both are related to Unix they are distant relatives and it is probably not to far from the truth if one assumes that Apple has done things to their programs so they don't play on Linux

[Midnighter]

Most would come from a windows background, so th demand for windows apps is what drives development.