I'm also getting this error after upgrading to xcode 9.1 and rubymotion 5.3 (I was able to run fine before the upgrades).
ERROR! The requested deployment target SDK is not available or supported by RubyMotion at this time.
When I try
xcodebuild -showsdks I'm told I have the following SDKs:
iOS SDKs: iOS 11.1 -sdk iphoneos11.1
iOS Simulator SDKs: Simulator - iOS 11.1 -sdk iphonesimulator11.1
As has been stated in the past by the rubymotion team:
Does this mean I should be including the following in my rakefile:
app.sdk_version = "11.1"
app.deployment_target = '11.1'
Because I've done this and it does not change the error. Including '11.0' doesn't work either (this is what is still shown on the rubymotion download page). Any other ideas? I'm quite new to ios and rubymotion so any help is much appreciated!