diff -ur xbmc-15.0-Isengard.orig/xbmc/visualizations/XBMCProjectM/libprojectM/Common.hpp xbmc-15.0-Isengard/xbmc/visualizations/XBMCProjectM/libprojectM/Common.hpp
--- xbmc-15.0-Isengard.orig/xbmc/visualizations/XBMCProjectM/libprojectM/Common.hpp	2015-07-22 03:41:29.000000000 +0900
+++ xbmc-15.0-Isengard/xbmc/visualizations/XBMCProjectM/libprojectM/Common.hpp	2016-03-31 21:46:24.945192642 +0900
@@ -57,11 +57,11 @@
 #endif
 			 
 #ifdef LINUX
-#define projectM_isnan isnan
+#define projectM_isnan std::isnan
 #endif
 
 #ifdef LINUX
-#define projectM_isnan isnan
+#define projectM_isnan std::isnan
 #endif
 
 #ifdef WIN32