"The Immigration Reform and Control Act" (IRCA) for EU applicants I'm a European Union citizen living in EU and applying for an assistant professorship position in US. The application form asks the question 


  For purposes of compliance with The Immigration Reform and Control Act, are you legally eligible for employment in the United States?


I know too little about U.S. immigration laws, and the text of the mentioned act looks complete gibberish to me. Could anyone say what the standard answer to this question would be and why?

Remark: this question is formally different from the one stated in a question on general eligibility (first, here the context is a particular legislation act with its own terminology, second, there the question contains "presently", and, third, there no answer refers to IRCA explicitly). In law matters, this difference may be important.
As far as I know, these clauses in application forms, are there for legal and nominal reasons only. The university is legally obliged by law to put this clause. This does not mean the committee will actually take this into consideration, and my experience is that they don't. 

You should thus write that you are not eligible to work currently in the US, as indeed you are not. But this should not constitute a cause for concern.