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-rw-r--r--apt-pkg/solver3.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/apt-pkg/solver3.h b/apt-pkg/solver3.h
index 435c1c279..019a01b9f 100644
--- a/apt-pkg/solver3.h
+++ b/apt-pkg/solver3.h
@@ -11,6 +11,7 @@
#include <memory>
#include <optional>
#include <queue>
+#include <type_traits>
#include <vector>
#include <apt-pkg/configuration.h>