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-rw-r--r--posix/unistd.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/posix/unistd.h b/posix/unistd.h
index 5c8d1b7f04..57652bfc3c 100644
--- a/posix/unistd.h
+++ b/posix/unistd.h
@@ -235,6 +235,7 @@ extern unsigned int alarm __P ((unsigned int __seconds));
SIGALRM signal while inside `sleep' call, the handling of the SIGALRM
signal afterwards is undefined. There is no return value to indicate
error, but if `sleep' returns SECONDS, it probably didn't work. */
+extern unsigned int __sleep __P ((unsigned int __seconds));
extern unsigned int sleep __P ((unsigned int __seconds));
#if defined(__USE_BSD) || defined(__USE_XOPEN_EXTENDED)