--- /dev/null
+diff --git a/lang/qt/src/qgpgmenewcryptoconfig.cpp b/lang/qt/src/qgpgmenewcryptoconfig.cpp
+index eb3af56..af47594 100644
+--- a/lang/qt/src/qgpgmenewcryptoconfig.cpp
++++ b/lang/qt/src/qgpgmenewcryptoconfig.cpp
+@@ -51,2 +51,3 @@
+ #include <cassert>
++#include <functional> /* std::mem_fn */
+
+diff --git a/lang/qt/src/threadedjobmixin.h b/lang/qt/src/threadedjobmixin.h
+index 32b23db..c4f85c2 100644
+--- a/lang/qt/src/threadedjobmixin.h
++++ b/lang/qt/src/threadedjobmixin.h
+@@ -53,2 +53,3 @@
+ #include <cassert>
++#include <functional> /* std::function */
+