--- contrib/python/matplotlib/py3/src/_image_resample.h	(index)
+++ contrib/python/matplotlib/py3/src/_image_resample.h	(working tree)
@@ -21,6 +21,8 @@
 
 #include "agg_workaround.h"
 
+#include <type_traits>
+
 // Based on:
 
 //----------------------------------------------------------------------------