From 2644464cc22b6d71605053f340fdab2ed976f969 Mon Sep 17 00:00:00 2001
From: eap <eap@opencascade.com>
Date: Wed, 19 Dec 2018 17:58:28 +0300
Subject: [PATCH] 23653: [CEA] SMESH compilation failure: Ubuntu 16 : isnan

---
 src/SMESH_I/SMESH_Measurements_i.cxx | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/SMESH_I/SMESH_Measurements_i.cxx b/src/SMESH_I/SMESH_Measurements_i.cxx
index 45f5f0b7f..e6e5493fa 100644
--- a/src/SMESH_I/SMESH_Measurements_i.cxx
+++ b/src/SMESH_I/SMESH_Measurements_i.cxx
@@ -38,6 +38,7 @@
 #include "SMESH_MeshAlgos.hxx"
 #include "SMESH_PythonDump.hxx"
 
+#include <cmath>
 
 using namespace SMESH;
 
@@ -368,7 +369,7 @@ CORBA::Double Measurements_i::Angle(const SMESH::PointStruct& p1,
   catch(...)
   {
   }
-  if ( isnan( angle ))
+  if ( std::isnan( angle ))
     angle = -1;
 
   return angle;