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#undef _SVID_SOURCE #define _SVID_SOURCE #include <math.h> #include <stdio.h> #include <stdlib.h> static int fail = 1; int matherr (struct exception *s) { printf ("matherr is working\n"); fail = 0; return 1; } int main (void) { _LIB_VERSION = _SVID_; acos (2.0); return fail; }