openpgp: add missing include

diff --git a/src/openpgp/openpgp.h b/src/openpgp/openpgp.h
index 4abbb080a13bd1334cd117492dc4bf1fea2f7c31..8b010a1f66efd123915a70a692daf2efaba8206d 100644 (file)
--- a/src/openpgp/openpgp.h
+++ b/src/openpgp/openpgp.h
@@ -3,6 +3,7 @@
 
 #pragma once
 
+#include <string>
 #include <vector>
 
 #include <gcrypt.h>