1.3.1 Can I run NeXT OPENSTEP or Mac OS X programs on GNUstep? ¶
You can’t run these programs on GNUstep, but if you have the source
code for the programs, you should be able to port them to GNUstep and
compile them. Whether or not you will be able to run them depends on how
complete GNUstep is at the time.