--- third_party/pdfium/xfa/fxbarcode/utils.h.orig	2016-05-30 10:24:54.071773744 +0000
+++ third_party/pdfium/xfa/fxbarcode/utils.h	2016-05-30 10:25:15.808219373 +0000
@@ -26,12 +26,10 @@
 #endif
 #if (_FX_OS_ == _FX_WIN32_DESKTOP_ || _FX_OS_ == _FX_WIN64_)
 #define FXSYS_isnan(x) _isnan(x)
-#elif(_FX_OS_ == _FX_MACOSX_ || _FX_OS_ == _FX_IOS_)
+#elif(_FX_OS_ == _FX_MACOSX_ || _FX_OS_ == _FX_IOS_ || \
+      _FX_OS_ == _FX_LINUX_DESKTOP_ || _FX_OS_ == _FX_ANDROID_)
 #include <cmath>
 #define FXSYS_isnan(x) std::isnan(x)
-#elif(_FX_OS_ == _FX_LINUX_DESKTOP_ || _FX_OS_ == _FX_ANDROID_)
-#include <math.h>
-#define FXSYS_isnan(x) isnan(x)
 #endif
 #if (_FX_OS_ == _FX_WIN32_DESKTOP_ || _FX_OS_ == _FX_WIN64_)
 #define FXSYS_nan() (std::numeric_limits<float>::quiet_NaN())