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+# Building QuakeSpasm
+## Prerequisites
+Since Apple has dropped support for Mac OS 10.4 and PowerPC from XCode 4, you need to hack your developer tools a bit. You need XCode 3.2.6 from here:
+
+http://connect.apple.com/cgi-bin/WebObjects/MemberSite.woa/wa/getSoftware?bundleID=20792
+
+Then, you need the XCode 4.2 installer from the Mac App Store. Don't start the installation yet.
+
+If you already have XCode 4 installed, you must uninstall it using the following command from a terminal:
+
+sudo /<XCode 4 path>/Library/uninstall-devtools --mode=all
+
+You must reboot your machine after that.
+
+Now you need to first install XCode 3.2.6 and then XCode 4.2. Then, you will add support for Mac OS 10.4 and 10.5 as well as PowerPC from XCode 3 to XCode 4. But first things first:
+
+### Install XCode 3
+If you are on Mac OS 10.7 (Lion), you must launch the XCode 3.2.6 installer from the terminal like so:
+
+export COMMAND_LINE_INSTALL=1
+open "/Volumes/Xcode and iOS SDK/Xcode and iOS SDK.mpkg"
+
+Otherwise, the installation will fail. Do not install "System Tools" or "Unix Development". You probably don't want to install the iOS SDKs either. You do want to install "Mac OS X 10.4 SDK" however - this is essential. Set "/XCode3" as the destination folder.
+
+### Install XCode 4
+Launch the installer from the App Store. Be aware that on some systems, you need to launch the installer manually: Right Click on "Install Xcode" and select Show Package Contents. Then navigate to "Contents/Resources" and double click on "Xcode.mpkg". Select "/XCode4" as the destination folder.
+
+### Restore 10.4 and 10.5 SDK support
+Open a terminal and run the following commands:
+
+cd /XCode4/SDKs
+sudo ln -s /Xcode3/SDKs/MacOSX10.4u.sdk .
+sudo ln -s /Xcode3/SDKs/MacOSX10.5.sdk .
+
+### Restore GCC 4.0 support (which gives you PowerPC support)
+In your terminal, run the following commands:
+
+cd /XCode4/usr/bin
+sudo ln -s /Xcode3/usr/bin/*4.0* .
+
+sudo ln -s "/XCode3/Library/Xcode/Plug-ins/GCC 4.0.xcplugin" "/XCode4/Library/Xcode/PrivatePlugIns/Xcode3Core.ideplugin/Contents/SharedSupport/Developer/Library/Xcode/Plug-ins"
+
+sudo mkdir -p /XCode4/usr/libexec/gcc
+sudo ln -sf /XCode3/usr/libexec/gcc/powerpc-apple-darwin10 /XCode4/usr/libexec/gcc/powerpc-apple-darwin10
+
+sudo mkdir -p /XCode4/usr/lib/gcc
+sudo ln -sf /XCode3/usr/lib/gcc/powerpc-apple-darwin10 /XCode4/usr/lib/gcc/powerpc-apple-darwin10
+
+This should be it. The guides in the link collection at the end of this documents contain information about changing the "as" command also, but I didn't have to do this on my systems. If you run into problems, let me know: kristian.duske@gmail.com
+
+## Building QuakeSpasm
+Now you can build QuakeSpasm. Simply open the project file using XCode 4.2 and make sure that "QuakeSpasm > My Mac 64-bit" is selected as the scheme in the toolbar. Select "Product > Run" from the menu to run and debug QuakeSpasm. This will not produce a universal binary however. To produce a universal binary for Intel 64bit, Intel 32bit and PowerPC 32bit, you need to select "Product > Archive" from the menu. This will create an application archive that contains the universal binary.
+
+# Useful Links
+- XCode 3.2.6:
+http://connect.apple.com/cgi-bin/WebObjects/MemberSite.woa/wa/getSoftware?bundleID=20792
+
+- Install XCode 3 on 10.7:
+http://anatomicwax.tumblr.com/post/8064949186/installing-xcode-3-2-6-on-lion-redux
+
+- Restore support for 10.4, 10.5 and PPC to XCode 4.0:
+http://stackoverflow.com/questions/5333490/how-can-we-restore-ppc-ppc64-as-well-as-full-10-4-10-5-sdk-support-to-xcode-4
+
+- Scripts that automate the above:
+https://github.com/thinkyhead/Legacy-XCode-Scripts
+
+# Author
+Kristian Duske, kristian.duske@gmail.com
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