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-rw-r--r--src/nonstd/flockfile.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/src/nonstd/flockfile.c b/src/nonstd/flockfile.c
new file mode 100644
index 00000000..54c86a36
--- /dev/null
+++ b/src/nonstd/flockfile.c
@@ -0,0 +1,5 @@
+#include <nonstd/io.h>
+
+#if !(defined _POSIX_C_SOURCE && 199506L <= _POSIX_C_SOURCE) && !(defined _XOPEN_SOURCE && 500 <= _XOPEN_SOURCE)
+#define flockfile(f) (void)(f)
+#endif