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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.
Did you set “OS X 10.10” to “Base SDK” setting for “openFrameworksLib.xcodeproj” ?
Actually the target setting does not seem to matter, but the more important thing is the setting in openFrameworksLib.xcodeproj.
In particular, I had troubles compiling the examples/addons/kinectExample project in the 0.8.4 OF OSX release. Following your instructions, no additional changes needed, it compiles (and runs) just fine now.