~$ mir_demo_client_fingerpaint 
Could not connect to a display server: Failed to process connect response: /build/mir-hp_9S4/mir-0.15.1+15.04.20150903/src/client/probing_client_platform_factory.cpp(37): Throw in function virtual std::shared_ptr<mir::client::ClientPlatform> mir::client::ProbingClientPlatformFactory::create_client_platform(mir::client::ClientContext*)
Dynamic exception type: N5boost16exception_detail10clone_implINS0_19error_info_injectorISt13runtime_errorEEEE
std::exception::what: No appropriate client platform module found