Index: mttroot/mtt/lib/cr/hh/squarelaw.hh
==================================================================
--- mttroot/mtt/lib/cr/hh/squarelaw.hh
+++ mttroot/mtt/lib/cr/hh/squarelaw.hh
@@ -1,9 +1,9 @@
 #ifndef SQUARELAW_HH
 #define SQUARELAW_HH
 
-#include <math.h>
+#include <cmath
 #include "sign.hh"
 
 inline double squarelaw(const double gain,
 			const causality_t causality, const int port,
 			const double input, const causality_t in_causality, const int in_port)

Index: mttroot/mtt/lib/cr/hh/staticpressure.hh
==================================================================
--- mttroot/mtt/lib/cr/hh/staticpressure.hh
+++ mttroot/mtt/lib/cr/hh/staticpressure.hh
@@ -1,9 +1,9 @@
 #ifndef STATICPRESSURE_HH
 #define STATICPRESSURE_HH
 
-#include <math.h>		// log, pow
+#include <cmath>		// log, pow
 
 #include "constants.hh"
 
 inline double
 staticpressure(const double beta,