Both current versions (2.1.1, 1.11.1) have syntactic errors in their minified distribution files which prevents compilation in strict mode. Try to execute them when prefixed by "use strict":

Syntax error: FunctionDeclaration in Statement context

(If you're not sure what that means, have a look at this StackOverflow question).

I'm not familiar with the build process, this might either be a bug in the minifier, or wrong usage of the minifier, or some problems with the custom build process of jQuery. If it's not your fault, please file an upstream bug with the used minifier.