Trouble building vim on a mac

I'm trying to build vim on a mac. I'm pretty new to macs, so I'm almost undoubtably doing something wrong. I have the Xcode developer tools etc. installed, but when I clone vim from the mercurial head, configure, and make, I get the following:
gcc -c -I. -Iproto -DHAVE_CONFIG_H -DFEAT_GUI_MAC -fno-common -fpascal-strings -Wall -Wn
o-unknown-pragmas -mdynamic-no-pic -pipe -I. -Iproto -DMACOS_X_UNIX -no-cpp-precomp -I/A
pplications/Xcode.app/Contents/Developer/Headers/FlatCarbon -g -O2 -U_FORTIFY_SOURCE -D
_FORTIFY_SOURCE=1 -I/usr/X11/include -o objects/buffer.o buffer.c
In file included from vim.h:338,
from buffer.c:28:
os_mac.h:26:64: error: Quickdraw.h: No such file or directory
os_mac.h:27:24: error: ToolUtils.h: No such file or directory
os_mac.h:28:21: error: LowMem.h: No such file or directory
os_mac.h:29:20: error: Scrap.h: No such file or directory
os_mac.h:30:20: error: Sound.h: No such file or directory
os_mac.h:31:24: error: TextUtils.h: No such file or directory
os_mac.h:33:22: error: OSUtils.h: No such file or directory
os_mac.h:34:20: error: Files.h: No such file or directory
os_mac.h:36:22: error: Script.h: No such file or directory
In file included from structs.h:81,
from vim.h:1731,
from buffer.c:28:
gui.h:37:20: error: Types.h: No such file or directory
gui.h:40:20: error: Fonts.h: No such file or directory
gui.h:41:21: error: Events.h: No such file or directory
gui.h:42:20: error: Menus.h: No such file or directory
gui.h:44:24: error: Windows.h: No such file or directory
gui.h:46:23: error: Controls.h: No such file or directory
gui.h:48:22: error: Dialogs.h: No such file or directory
[extensive output redacted]

Anyone run into this before and/or know what I'm doing wrong off the top of their head?

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