References:
If you install Xcode 7.3, it only ships with OS X 10.11 SDK, and this unfortunately causes problems when you want to compile code targeting an earlier OS X version, such as 10.9. To fix this, I did what's described in the reference page linked above. The steps are:
- Quit Xcode 7.3
- Get Xcode 6.4 which contains SDKs for OS X 10.9 and 10.10. It's probably going to be an Xcode_6.4.dmg
- Mount the DMG using
hdiutil
probably to /Volumes/Xcode - The SDKs are located in
Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/
MacOSX10.9.sdk
MacOSX10.10.sdk
- Copy the required SDKs to
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/
- Open file
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Info.plist
and remove the following lines:<key>MinimumSDKVersion</key> <string>10.11</string>