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autoconf implementation for powl()

From: Tom Vijlbrief
Subject: autoconf implementation for powl()
Date: Thu, 26 Apr 2012 19:26:21 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:11.0) Gecko/20120329 Thunderbird/11.0.1

Autoconf 2.67 uses the following code to test for powl():
  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h.  */

#define _ISOC9X_SOURCE  1
#define _ISOC99_SOURCE  1
#define __USE_ISOC99    1
#define __USE_ISOC9X    1
#include <math.h>
main ()
        int value = powl (1.0) ;
  return 0;

This obviously fails because powl takes two arguments.
I expect:

int value = powl (1.0, 1.0);

It looks like a copy/paste error from fabsl(long double)

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