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-rw-r--r--libbutl/sendmail.ixx1
1 files changed, 1 insertions, 0 deletions
diff --git a/libbutl/sendmail.ixx b/libbutl/sendmail.ixx
index b88ee20..9746a8b 100644
--- a/libbutl/sendmail.ixx
+++ b/libbutl/sendmail.ixx
@@ -2,6 +2,7 @@
// copyright : Copyright (c) 2014-2017 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
+#include <cstddef> // size_t
#include <utility> // move(), forward()
namespace butl