Porting Unix apps to Mac OS X

-JP-

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Since i know fairly little about this I wass wondering if anyone here could help me.

I was under the impression that porting a Unix app from a intel version of Unix was a fairly simple deal. A recompile the sourcecode using the developer tools (with some tweeking required) kind of deal. But then I came to wonder if porting any app from a intel based system to a PPC based system complicates things further.

Could anyone explain this to me?
 
the problem usually lies more with the fact that you are moving your software from one UNIX to another, with slightly different APIs, than the fact that your processor is different. for example, porting gnome for linux/intel to linux/ppc requires just a recompile. but OSX has different APIs from linux and other UNIXes, so it might be more work.
 
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