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-rw-r--r--paludis/filter.hh1
1 files changed, 1 insertions, 0 deletions
diff --git a/paludis/filter.hh b/paludis/filter.hh
index 2ef558d07..14fd195dc 100644
--- a/paludis/filter.hh
+++ b/paludis/filter.hh
@@ -33,6 +33,7 @@
#include <paludis/dep_spec-fwd.hh>
#include <paludis/match_package-fwd.hh>
#include <paludis/repository-fwd.hh>
+#include <functional>
#include <memory>
#include <functional>