diff -ruN qt-everywhere-src-5.14.2.orig/qtimageformats/src/plugins/imageformats/jp2/qjp2handler.cpp qt-everywhere-src-5.14.2/qtimageformats/src/plugins/imageformats/jp2/qjp2handler.cpp
--- qt-everywhere-src-5.14.2.orig/qtimageformats/src/plugins/imageformats/jp2/qjp2handler.cpp	2020-03-03 13:10:30.000000000 +0000
+++ qt-everywhere-src-5.14.2/qtimageformats/src/plugins/imageformats/jp2/qjp2handler.cpp	2020-11-16 19:57:56.792619032 +0000
@@ -38,4 +38,5 @@
 **
 ****************************************************************************/
 
+#include <math.h>
 #include "qjp2handler_p.h"