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-rw-r--r--src/tc-proc.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/tc-proc.c b/src/tc-proc.c
index c17b232..9af1eba 100644
--- a/src/tc-proc.c
+++ b/src/tc-proc.c
@@ -1,4 +1,5 @@
// SPDX-License-Identifier: MIT
+#define _POSIX_C_SOURCE 999900L /* cygwin:fdopen */
#ifdef __cplusplus
# include <cerrno>
# include <cstdio>