From: Boris Pek
Date: Thu, 05 May 2016 15:38:47 +0300
Subject: [PATCH] fix build with GCC >= 6.x

diff --git a/ofstd/libsrc/ofstd.cc b/ofstd/libsrc/ofstd.cc
--- a/ofstd/libsrc/ofstd.cc
+++ b/ofstd/libsrc/ofstd.cc
@@ -175,7 +175,7 @@
 
 
 // some systems don't properly define isnan()
-#ifdef HAVE_ISNAN
+#if defined(HAVE_ISNAN) && (__cplusplus < 201103L)
 #ifndef HAVE_PROTOTYPE_ISNAN
 extern "C"
 {