glibc/sysdeps/stub/e_powl.c

#include <math.h>
#include <stdio.h>
#include <errno.h>

long double
__ieee754_powl (long double x, long double y)
{
  fputs ("__ieee754_powl not implemented\n", stderr);
  __set_errno (ENOSYS);
  return 0.0;
}

stub_warning (__ieee754_powl)