Include the functional header

djw8605 · djw8605 · commit 6caa5b5e64ae · 2021-01-26T13:32:04.000-06:00
diff --git a/src/scitokens_internal.cpp b/src/scitokens_internal.cpp
@@ -1,6 +1,7 @@
 
 #include <memory>
 #include <sstream>
+#include <functional>
 
 #include <curl/curl.h>
 #include <jwt-cpp/base.h>
