https://www.openwall.com/lists/musl/2026/07/13/3

>From e28fefd3e46c5e7537a2901a9c3494e946eaae85 Mon Sep 17 00:00:00 2001
From: Szabolcs Nagy <nsz@port70.net>
Date: Mon, 13 Jul 2026 06:44:27 +0000
Subject: [PATCH] clock_nanosleep: define SYS_nanosleep to fix riscv32

riscv32 does not have SYS_nanosleep, but it is used in unreachable
fallback code.
---
 src/time/clock_nanosleep.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/time/clock_nanosleep.c b/src/time/clock_nanosleep.c
index e195499c..f75f7f2a 100644
--- a/src/time/clock_nanosleep.c
+++ b/src/time/clock_nanosleep.c
@@ -19,6 +19,9 @@ int __clock_nanosleep(clockid_t clk, int flags, const struct timespec *req, stru
 		return -r;
 	long long extra = s - CLAMP(s);
 	long ts32[2] = { CLAMP(s), ns };
+#ifndef SYS_nanosleep
+#define SYS_nanosleep -1
+#endif
 	if (clk == CLOCK_REALTIME && !flags)
 		r = __syscall_cp(SYS_nanosleep, &ts32, &ts32);
 	else
-- 
2.52.0