Xcode 7 does not include OS X SDK 10.10 or earlier and this causes errors complaining about OpenSSL when building an oF project.
To overcome this, before upgrading to Xcode 7, you need to make and keep a copy of "MacOSX10.10.sdk" from the current Xcode, which can be found in "Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs" folder.
And after upgrading to Xcode 7, put MacOSX10.10.sdk back into the same location, and set Base SDK setting of your projects (both the target and the "openFrameworksLib.xcodeproj") to "OS X 10.10". This will make your current project alive.
