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-rw-r--r--src/tc-netio.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/tc-netio.c b/src/tc-netio.c
index 4510d0a..d3c2929 100644
--- a/src/tc-netio.c
+++ b/src/tc-netio.c
@@ -1,5 +1,6 @@
// SPDX-License-Identifier: MIT
#define WIN32_LEAN_AND_MEAN 1
+#define _POSIX_C_SOURCE 999900L /* cygwin-need:freeaddrinfo */
#ifdef __cplusplus
# include <cstdlib>
# include <cstdio>