@mattabat
I don't know where you got your copy of Mac OS X, but Tiger came with XCode, which comes with the compiler one needs to compile unlzx (which I have done in the past under OS X).
The install was made from the original Mac OS X Tiger DVD.
Perhaps I forgot to tick some "include XCode" while installing?
It was a vanilla install. It did not include compiler before I downloaded and installed it.
I don't want to speculate..
About what? I bought the DVD, in case you're wondering. I consider it within my rights to install it on non-Mac hardware, regardless of the EULA.
Anyway, if the compiler is included it should be trivial to compile the unlzx, indeed.