I am having Xcode 4.4 on OS X Lion. I'd like to install the Mac 10.6 SDK - also known as macosx10.7 SDK - because I need to compile openFrameworks.
I found that I need to download additional tools from this site. However I didn't find any 10.6 SDK there. I also tried looking in Xcode Preferences -> Downloads -> Components, but there is no way.
I am wondering how can I install previous SDKs for Xcode?
Unfortunately, Apple tends to make this much harder than you'd like. You can't download SDKs by themselves. They come as part of specific versions of Xcode. So you have to download the right version of Xcode. Search for "10.6", and you'll see that you want Xcode 4.1.
Once you download that, you can install it (that version will go into /Developer, so it won't break your /Applications version), or you can open up the package and find the SDKs in it. If you don't know how to crack open these packages, just install it.
Once you do that, search for "MacOSX10.6.sdk". I forget exactly where it is in that particular version.
What I do at that point is copy the sdk into a /SDKs directory. That way I always have them all.
Now, you need to add it to your current version of Xcode. You can do that by making symlinks in /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs. If you like, you can use my tiny link-sdks script for that.
UPDATE: In modern versions of Xcode (7.3+) to use older SDKs edit MinimumSDKVersion here:
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Info.plist
If you search the openFrameworks forums, there are a few posts where people are providing download links from their public Dropbox folders, for example.
Somewhat off topic, but I hit a very similar problem trying to install Erlang using kerl.
Everything worked for me until the "kerl build ..." step. The build log showed the following error:
odbcserver.c:117:10: fatal error: 'sql.h' file not found #include "sql.h"
The problem is that the ODBC is no longer part of the Mavericks installation(i.e., MacOS 10.6 SDK isn't installed). Piecing together advice from a variety of sites, none of which worked by themselves, the following set of steps fixed the issue:
Set CFLAGS to point to the include directory for the unixodbc installation as part of the kerl build command (e.g.,):
CFLAGS="-I/usr/local/Cellar/unixodbc/2.3.2/include" ./kerl build R15B R15B
This points the build to the ODBC include files.
My environment is Mavericks, the xcode command line tools, and xcode v5.1.1.
Some SDK(with Xcode) you can download from direct links. List here: http://iphonesdkdev.blogspot.ru/2010/04/old-versions-of-iphone-sdk.html
Some don't work, but something you can still download. For example: http://adcdownload.apple.com/Developer_Tools/xcode_3.2.6_and_ios_sdk_4.3__final/xcode_3.2.6_and_ios_sdk_4.3.dmg
