Include functional

minorsecond · minorsecond · commit 95245e5f564e · 2023-04-29T11:01:09.000-06:00
diff --git a/src/graphing_calculations.cpp b/src/graphing_calculations.cpp
@@ -7,6 +7,7 @@
 #include <cstring>
 #include <sstream>
 #include <algorithm>
+#include <functional>
 #include "graphing_calculations.h"
 
 #ifdef __WIN32
