Thanks for your help.

Biohisham: That's probably a good idea. I might need modules again some day...

Khen: Okay, I don't understand much about that, but I tried running those programs. The first one seems to have installed a great many things, and spat out plenty of error messages, most of them about 'YAML' not being installed or 'make' failing in various ways. The last lines are

KTHAKORE/Alien-SDL-1.2.tar.gz
  [depend] -- NOT OK
Prepending /Users/Chuma/.cpan/build/Test-Harness-3.21-HIJuax/blib/arch
+ /Users/Chuma/.cpan/build/Test-Harness-3.21-HIJuax/blib/lib to PERL5L
+IB for 'test'
Running Build test
  Make had some problems, won't test
Running Build install
  Make had some problems, won't install
[download]

I tried running the second one anyway, but it Can't locate Alien/SDL.pm in @INC.
Any more ideas?

EDIT: I tried (after reading the aforementioned tutorial) installing SDL::App with CPAN, and I get some more YAML-related errors. I tried 'make' on the YAML directory, and got No rule to make target `/System/Library/Perl/5.10.0/darwin-thread-multi-2level/CORE/config.h', needed by `Makefile'.  Stop. So I tried using CPAN again, "install YAML". Oddly enough, it also complains about YAML not being installed, and then comes to the same conclusion about config.h.