@@ -102,11 +102,11 @@
         ln2lo = 1.90821492927058770002e-10,   /* 0x3dea39ef, 0x35793c76 */
         one = 1.0,
         zero = 0.0;
 
 static const int hiinf = 0x7ff00000;
-double atan2pi(double, double);
+extern double atan2pi(double, double);
 
 /*
  * Assuming |t[0]| > |t[1]| and |t[2]| > |t[3]|, sum4fp subroutine
  * compute t[0] + t[1] + t[2] + t[3] into two double fp numbers.
  */