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-rw-r--r--include/unistd.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/unistd.h b/include/unistd.h
index 6c2d1cece..d8a25dfa1 100644
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -30,6 +30,7 @@ extern void usleep __P ((unsigned long __microseconds));
extern int pause __P ((void));
extern char* crypt __P((__const char *__key, __const char *__salt));
extern int isatty __P ((int __fd));
+extern char *ttyname __P ((int __fd));
extern int readlink __P ((__const char *__path, char *__buf, size_t __len));
extern int link __P ((__const char *__from, __const char *__to));
extern int symlink __P ((__const char *__from, __const char *__to));