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-rw-r--r--ext/socket/sockport.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/ext/socket/sockport.h b/ext/socket/sockport.h
index d19b1e1dbaa..e1cddf53f4e 100644
--- a/ext/socket/sockport.h
+++ b/ext/socket/sockport.h
@@ -69,4 +69,8 @@
# define PF_INET AF_INET
#endif
+#if defined(HOST_NOT_FOUND) && !defined(h_errno) && !defined(__CYGWIN__)
+extern int h_errno;
+#endif
+
#endif