Xcode

NOTE: Homebrew only officially supports Xcode 3.1.4 on 10.5 (no earlier versions) and 3.2.x on 10.6. Xcode 4 is not supported while it is in preview mode. When it gets an official release, rest assured that we will get right on top of it.

For those who don't want to install the whole of Xcode, the Xcode DMG actually contains many many individual .pkg installers (this is Xcode 4 preview 5 iOS DMG):

ApplicationLoader.pkg
BluetoothSDK.pkg
CoreAudioSDK.pkg
Dashcode.pkg
DevDocumentation.pkg
DevSDK.pkg
DevSamples.pkg
DevToolsDocumentation.pkg
DeveloperDiskImage4_2.pkg
DeveloperDiskImageReleased.pkg
DeveloperTools.pkg
DeveloperToolsCLI.pkg
DeveloperToolsSystemSupport.pkg
DistributedBuildsSupport.pkg
DocDownloadOff.pkg
DocDownloadOn.pkg
FireWireSDK.pkg
Git.pkg
JavaSDK.pkg
MacOSX10.5.pkg
MacOSX10.6.pkg
MobileDevice.pkg
OpenGLApps.pkg
OpenGLSDK.pkg
OtherDevDocumentation.pkg
QuickTimeSDK.pkg
RelocatableScript.pkg
SystemScript.pkg
VersionedDeveloperToolsSystemSupport.pkg
WebKitSDK.pkg
X11Documentation.pkg
X11SDK.pkg
XcodeTools.pkg
Xcode_MacOSX10.6_Extras.pkg
Xcode_System_Tools_MacOSX10.6_Extras.pkg
XcodeiPhonePlugins.pkg
clang.pkg
gcc4.2.pkg
gcc4.2ADCDocs.pkg
iPhoneDocumentation.pkg
iPhoneHostSideTools.pkg
iPhoneSDK3_0.pkg
iPhoneSDK3_1.pkg
iPhoneSDK3_1_2.pkg
iPhoneSDK3_1_3.pkg
iPhoneSDK3_2.pkg
iPhoneSDK4_0.pkg
iPhoneSDK4_1.pkg
iPhoneSDK4_2.pkg
iPhoneSDKSnowLeopardExtras.pkg
iPhoneSDKTools.pkg
iPhoneSimulatorSDK3_2.pkg
iPhoneSimulatorSDK4_0.pkg
iPhoneSimulatorSDK4_1.pkg
iPhoneSimulatorSDK4_2.pkg
iPhoneSimulatorSDKTools.pkg
iPhoneSystemComponents.pkg
llvm-gcc4.2.pkg
xcrun.pkg

Which ones of those does Homebrew actually need? Someone needs to figure that out. Here's my initial (untested) guess:

DeveloperTools.pkg
DeveloperToolsCLI.pkg
DeveloperToolsSystemSupport.pkg
JavaSDK.pkg
OpenGLSDK.pkg
X11SDK.pkg
clang.pkg
gcc4.2.pkg
llvm-gcc4.2.pkg