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-rw-r--r--apt-pkg/contrib/weakptr.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/apt-pkg/contrib/weakptr.h b/apt-pkg/contrib/weakptr.h
index 5158e393c..8de727d89 100644
--- a/apt-pkg/contrib/weakptr.h
+++ b/apt-pkg/contrib/weakptr.h
@@ -22,6 +22,8 @@
#define WEAK_POINTER_H
#include <set>
+#include <stddef.h>
+
/**
* Class for objects providing support for weak pointers.
*