Fix missing header

rthrfrd · rthrfrd · commit a772bffe9971 · 2023-06-26T13:42:04.000+01:00
diff --git a/include/webxx.h b/include/webxx.h
@@ -27,6 +27,7 @@
 
 #include <cstddef>
 #include <cstring>
+#include <functional>
 #include <memory>
 #include <string>
 #include <string_view>
