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-rw-r--r--c/src/lib/libc/libio.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/c/src/lib/libc/libio.c b/c/src/lib/libc/libio.c
index 66617700a3..defc156aa0 100644
--- a/c/src/lib/libc/libio.c
+++ b/c/src/lib/libc/libio.c
@@ -25,6 +25,8 @@
#if ! defined(O_NDELAY)
# if defined(solaris2)
# define O_NDELAY O_NONBLOCK
+# elif defined(__CYGWIN__)
+# define O_NDELAY _FNBIO
# elif defined(RTEMS_NEWLIB)
# define O_NDELAY _FNBIO
# endif