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-rw-r--r--apt-pkg/contrib/weakptr.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/apt-pkg/contrib/weakptr.h b/apt-pkg/contrib/weakptr.h
index 5158e393c..ed92eb3f9 100644
--- a/apt-pkg/contrib/weakptr.h
+++ b/apt-pkg/contrib/weakptr.h
@@ -21,6 +21,7 @@
#ifndef WEAK_POINTER_H
#define WEAK_POINTER_H
+#include <cstdlib>
#include <set>
/**
* Class for objects providing support for weak pointers.