When I try to run it, I get the lines below. Anyone know how to solve this ?

Last login: Tue Apr 13 12:48:30 on ttyp4
Welcome to Darwin!
/Users/beernaert/Desktop/dosbox; exit
Computer-van-administrator:~ beernaert$ /Users/beernaert/Desktop/dosbox; exit
dyld: /Users/beernaert/Desktop/dosbox can't open library: /usr/local/lib/libSDL-1.2.0.dylib (No such file or directory, errno = 2)
Trace/BPT trap
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