From bc8b18dbfd1870b5d17a90eabedf46c601c22312 Mon Sep 17 00:00:00 2001
From: Shinya Kitaoka <skitaoka@gmail.com>
Date: Jun 24 2016 10:47:47 +0000
Subject: Merge pull request #518 from ideasman42/linux-isnan-pr


Use cmath instead of defining isnan (Linux build-fix)
---

diff --git a/toonz/sources/common/tapptools/tcolorutils.cpp b/toonz/sources/common/tapptools/tcolorutils.cpp
index d05d375..3c5d2dc 100644
--- a/toonz/sources/common/tapptools/tcolorutils.cpp
+++ b/toonz/sources/common/tapptools/tcolorutils.cpp
@@ -6,6 +6,7 @@
 
 #include <set>
 #include <list>
+#include <cmath>
 
 typedef float KEYER_FLOAT;
 
@@ -13,7 +14,6 @@ typedef float KEYER_FLOAT;
 #ifdef _WIN32
 #define ISNAN _isnan
 #else
-extern "C" int isnan(double);
 #define ISNAN isnan
 #endif
 
diff --git a/toonz/sources/stdfx/pins.cpp b/toonz/sources/stdfx/pins.cpp
index b4ddf97..b72016e 100644
--- a/toonz/sources/stdfx/pins.cpp
+++ b/toonz/sources/stdfx/pins.cpp
@@ -6,11 +6,12 @@
 #include "tmathutil.h"
 #include "tofflinegl.h"
 
+#include <cmath>
+
 //------------------------------------------------------------------------------
 #ifdef _WIN32
 #define ISNAN _isnan
 #else
-extern "C" int isnan(double);
 #define ISNAN isnan
 #endif