No Longer Compiles With 5.0.0 - 'string' file not found

[giantramen]

We are trying to update to 5.0.0 in our project that is currently running 4.4 and can no longer build any files that try to import GTXiLib.

/GTXiLib/accessibility_label_not_punctuated_check.h:20:10: 'string' file not found
GTXiLib/xml_utils.h:22:10: While building module 'tinyxml' imported from 
GTXiLib/xml_utils.h:22:
/<module-includes>:1:9: In file included from <module-includes>:1:
tinyxml/tinyxml-umbrella.h:13:9: In file included from 
tinyxml/tinyxml-umbrella.h:13:
tinyxml/tinyxml2.h:36:13: 'cctype' file not found
Test/TestUITests/TestUITests.swift:9:8: Could not build Objective-C module 'GTXiLib'

I have attached a sample project where I just created a new project and imported GTXiLib via cocoapods as described in the README and am getting the error above.
Test.zip