Unable to install GHC on Mac

[MeineWenigkeit]

Hi! I tried to install the GHC on my Macbook Pro (Snow Leopard 10.6.4 64bit), but the button "Install" is deactivated in the Installing Manager:
I have installed XCode 3.2.2 and I am admin. Here is the protocol, but no errors where found:

Oct 16 17:55:35 [Computername] Installer[4987]: @(#)PROGRAM:Install  PROJECT:Install-581
Oct 16 17:55:35 [Computername] Installer[4987]: @(#)PROGRAM:Installer  PROJECT:Installer-430.1
Oct 16 17:55:35 [Computername] Installer[4987]: Hardware: MacBookPro7,1 @ 2.40 GHz (x 2), 4096 MB RAM
Oct 16 17:55:35 [Computername] Installer[4987]: Running OS Build: Mac OS X 10.6.4 (10F569)
Oct 16 17:55:35 [Computername] Installer[4987]: Env: PATH=/usr/bin:/bin:/usr/sbin:/sbin
Oct 16 17:55:35 [Computername] Installer[4987]: Env: TMPDIR=/var/folders/UR/UROpX+xEH8CmVrI7zdMVfE+++TI/-Tmp-/
Oct 16 17:55:35 [Computername] Installer[4987]: Env: SHELL=/bin/bash
Oct 16 17:55:35 [Computername] Installer[4987]: Env: HOME=/Users/[Username]
Oct 16 17:55:35 [Computername] Installer[4987]: Env: USER=[Username]
Oct 16 17:55:35 [Computername] Installer[4987]: Env: LOGNAME=[Username]
Oct 16 17:55:35 [Computername] Installer[4987]: Env: DISPLAY=/tmp/launch-PVPrcz/org.x:0
Oct 16 17:55:35 [Computername] Installer[4987]: Env: SSH_AUTH_SOCK=/tmp/launch-jMfG5D/Listeners
Oct 16 17:55:35 [Computername] Installer[4987]: Env: Apple_PubSub_Socket_Render=/tmp/launch-PV900L/Render
Oct 16 17:55:35 [Computername] Installer[4987]: Env: COMMAND_MODE=unix2003
Oct 16 17:55:35 [Computername] Installer[4987]: Env: __CF_USER_TEXT_ENCODING=0x1F5:0:3
Oct 16 17:55:35 [Computername] Installer[4987]: Glasgow Haskell Compiler  Installation Log
Oct 16 17:55:35 [Computername] Installer[4987]: Opened from: /Volumes/Haskell Platform 2010.2.0.0/GHC-6.12.3-i386.pkg

Can you help me, please?
P. Gölz

PS: Sorry for my bad English, I'm from Germany

[igloo]

Hmm, I have Xcode 3.1.4 (according to xcodebuild -version).

Do any OS X people know what's going on?

[MeineWenigkeit]

Replying to igloo:

Hmm, I have Xcode 3.1.4 (according to xcodebuild -version). Do any OS X people know what's going on?

I was said I had to install XCode ("a suite of tools for developing software on Mac OS X, developed by Apple", Wikipedia) to make the installation working. But it didn't help.

[MeineWenigkeit]

I found the mistake. When I installed XCode, I forgot to enable the "Unix Development Support" option that is required to make it work.