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-rw-r--r--paludis/metadata_key.hh1
1 files changed, 1 insertions, 0 deletions
diff --git a/paludis/metadata_key.hh b/paludis/metadata_key.hh
index b03005be8..6d2e9db3d 100644
--- a/paludis/metadata_key.hh
+++ b/paludis/metadata_key.hh
@@ -38,6 +38,7 @@
#include <paludis/util/simple_visitor.hh>
#include <paludis/util/type_list.hh>
#include <paludis/util/timestamp-fwd.hh>
+#include <paludis/util/set.hh>
#include <tr1/type_traits>
#include <string>