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-rw-r--r--newlib/libc/include/sys/unistd.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/newlib/libc/include/sys/unistd.h b/newlib/libc/include/sys/unistd.h
index 4a3288322..9f2f2a5cb 100644
--- a/newlib/libc/include/sys/unistd.h
+++ b/newlib/libc/include/sys/unistd.h
@@ -146,6 +146,9 @@ long _EXFUN(sysconf, (int __name ));
pid_t _EXFUN(tcgetpgrp, (int __fildes ));
int _EXFUN(tcsetpgrp, (int __fildes, pid_t __pgrp_id ));
char _EXFUN(*ttyname, (int __fildes ));
+#if defined(__CYGWIN__)
+int _EXFUN(ttyname_r, (int, char * size_t));
+#endif
int _EXFUN(unlink, (const char *__path ));
int _EXFUN(vhangup, (void ));
_READ_WRITE_RETURN_TYPE _EXFUN(write, (int __fd, const void *__buf, size_t __nbyte ));