--- mira-4.0.2/src/mira/ads.C
+++ mira-4.0.2/src/mira/ads.C
@@ -31,10 +31,11 @@
  * Routines for computing scores and some other classification number are
  *  provided, too.
  *
  */
 
+#include <cmath>
 
 #include "ads.H"
 
 #include "errorhandling/errorhandling.H"
 #include "util/dptools.H"