--- gpgme-1.8.0/lang/qt/src/threadedjobmixin.h
+++ gpgme-1.8.0/lang/qt/src/threadedjobmixin.h
@@ -51,6 +51,7 @@
 #include "job.h"
 
 #include <cassert>
+#include <functional>
 
 namespace QGpgME
 {
--- gpgme-1.8.0/lang/qt/src/qgpgmenewcryptoconfig.cpp
+++ gpgme-1.8.0/lang/qt/src/qgpgmenewcryptoconfig.cpp
@@ -48,6 +48,7 @@
 
 #include <sstream>
 #include <string>
+#include <functional>
 #include <cassert>
 
 using namespace QGpgME;