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-rw-r--r--ext/asio/asio/impl/error_code.ipp1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/asio/asio/impl/error_code.ipp b/ext/asio/asio/impl/error_code.ipp
index b0566ed6c9..218c09ba41 100644
--- a/ext/asio/asio/impl/error_code.ipp
+++ b/ext/asio/asio/impl/error_code.ipp
@@ -11,6 +11,7 @@
#ifndef ASIO_IMPL_ERROR_CODE_IPP
#define ASIO_IMPL_ERROR_CODE_IPP
+// strerror() needs <cstring>
#include <cstring>
#if defined(_MSC_VER) && (_MSC_VER >= 1200)