diff --git a/lib/inc/drogon/HttpTypes.h b/lib/inc/drogon/HttpTypes.h
index b2c8c431..bdc19690 100644
--- a/lib/inc/drogon/HttpTypes.h
+++ b/lib/inc/drogon/HttpTypes.h
@@ -14,6 +14,7 @@
 #pragma once
 #include <atomic>
 #include <thread>
+#include <iostream>
 
 namespace drogon
 {
@@ -168,5 +169,26 @@ enum class WebSocketMessageType
     Close,
     Unknown
 };
-
+inline std::ostream &operator<<(std::ostream &out, drogon::ReqResult result)
+{
+    switch (result)
+    {
+        case ReqResult::Ok:
+            return out << "OK";
+        case ReqResult::BadResponse:
+            return out << "Bad response from server";
+        case ReqResult::NetworkFailure:
+            return out << "Network failure";
+        case ReqResult::BadServerAddress:
+            return out << "Bad server address";
+        case ReqResult::Timeout:
+            return out << "Timeout";
+        case ReqResult::HandshakeError:
+            return out << "Handshake error";
+        case ReqResult::InvalidCertificate:
+            return out << "Invalid certificate";
+        default:
+            return out << "Unknown error";
+    }
+}
 }  // namespace drogon
diff --git a/lib/inc/drogon/utils/Utilities.h b/lib/inc/drogon/utils/Utilities.h
index 29201fc0..83ba1432 100644
--- a/lib/inc/drogon/utils/Utilities.h
+++ b/lib/inc/drogon/utils/Utilities.h
@@ -28,8 +28,8 @@
 #include <algorithm>
 #ifdef _WIN32
 #include <time.h>
-char *strptime(const char *s, const char *f, struct tm *tm);
-time_t timegm(struct tm *tm);
+DROGON_EXPORT char *strptime(const char *s, const char *f, struct tm *tm);
+DROGON_EXPORT time_t timegm(struct tm *tm);
 #endif
 namespace drogon
 {
diff --git a/orm_lib/inc/drogon/orm/Criteria.h b/orm_lib/inc/drogon/orm/Criteria.h
index c0a6c77a..5b1aa398 100644
--- a/orm_lib/inc/drogon/orm/Criteria.h
+++ b/orm_lib/inc/drogon/orm/Criteria.h
@@ -256,15 +256,17 @@ class DROGON_EXPORT Criteria
     }
 
   private:
-    friend const Criteria operator&&(Criteria cond1, Criteria cond2);
+    friend DROGON_EXPORT const Criteria operator&&(Criteria cond1,
+                                                   Criteria cond2);
 
-    friend const Criteria operator||(Criteria cond1, Criteria cond2);
+    friend DROGON_EXPORT const Criteria operator||(Criteria cond1,
+                                                   Criteria cond2);
     std::string conditionString_;
     std::function<void(internal::SqlBinder &)> outputArgumentsFunc_;
 };  // namespace orm
 
-const Criteria operator&&(Criteria cond1, Criteria cond2);
-const Criteria operator||(Criteria cond1, Criteria cond2);
+DROGON_EXPORT const Criteria operator&&(Criteria cond1, Criteria cond2);
+DROGON_EXPORT const Criteria operator||(Criteria cond1, Criteria cond2);
 
 }  // namespace orm
 }  // namespace drogon