diff -purw src/options.h src/options.h
--- src/options.h	2020-05-13 13:26:39.743491698 +0200
+++ src/options.h	2020-05-13 13:28:47.277181534 +0200
@@ -1,5 +1,6 @@
 #pragma once
 
+#include <string>
 #include <unordered_map>
 
 std::unordered_map<std::string, std::string> ParseOptions(int argc,