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/usr/s390x-linux-gnu/include/bits/fenvinline.h is in libc6-dev-s390x-cross 2.23-0ubuntu3cross1.

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/* This file provides inline versions of floating-pint environment
   handling functions.  If there were any.  */

#ifndef __NO_MATH_INLINES

/* Here is where the code would go.  */

#endif