diff -Nurd lerc-4.0.0.orig/src/LercLib/Lerc.cpp lerc-4.0.0/src/LercLib/Lerc.cpp
--- lerc-4.0.0.orig/src/LercLib/Lerc.cpp	2022-07-15 14:25:29.000000000 -0400
+++ lerc-4.0.0/src/LercLib/Lerc.cpp	2023-10-01 04:06:04.000000000 -0400
@@ -26,6 +26,7 @@
 #include "Lerc2.h"
 #include <typeinfo>
 #include <limits>
+#include <functional>
 
 #ifdef HAVE_LERC1_DECODE
   #include "Lerc1Decode/CntZImage.h"