Craig,
You'll have to install not only X11, but also its SDK.
Go to:
http://www.apple.com/macosx/x11
then scroll to the bottom of the page, and on the right hand side
you'll see a small box with the title "Developer’s Kit"; inside this
box are links to both of the installers you need.
I have installed the following:
1. Apple's X11
2. Apple Dev Tools Dec. 2002
3. Fink
Typed fink install pymol. After about 30 min. of text scrolled up my
page, I get the following fatal error:
make: *** [glut_8x13.o] Error 1
### execution of failed, exit code 2
Failed: compiling glut-3.7-3