diff --git a/thread.c b/thread.c
index e756238ba6..abd91e1e2e 100644
--- a/thread.c
+++ b/thread.c
@@ -146,7 +146,7 @@ static int rb_threadptr_pending_interrupt_empty_p(const rb_thread_t *th);
 static const char *thread_status_name(rb_thread_t *th, int detail);
 static int hrtime_update_expire(rb_hrtime_t *, const rb_hrtime_t);
 NORETURN(static void async_bug_fd(const char *mesg, int errno_arg, int fd));
-static int consume_communication_pipe(int fd);
+MAYBE_UNUSED(static int consume_communication_pipe(int fd));
 
 static volatile int system_working = 1;
 static rb_internal_thread_specific_key_t specific_key_count;
@@ -263,6 +263,8 @@ timeout_prepare(rb_hrtime_t **to, rb_hrtime_t *rel, rb_hrtime_t *end,
 }
 
 MAYBE_UNUSED(NOINLINE(static int thread_start_func_2(rb_thread_t *th, VALUE *stack_start)));
+MAYBE_UNUSED(static bool th_has_dedicated_nt(const rb_thread_t *th));
+MAYBE_UNUSED(static int waitfd_to_waiting_flag(int wfd_event));
 
 #include THREAD_IMPL_SRC
 
diff --git a/thread_none.c b/thread_none.c
index 4d53d3bf4d..d3b533110e 100644
--- a/thread_none.c
+++ b/thread_none.c
@@ -46,10 +46,12 @@ rb_thread_sched_init(struct rb_thread_sched *sched, bool atfork)
 {
 }
 
+#if 0
 static void
 rb_thread_sched_destroy(struct rb_thread_sched *sched)
 {
 }
+#endif
 
 // Do nothing for mutex guard
 void
diff --git a/thread_win32.c b/thread_win32.c
index bd983e0bd9..4fd488db60 100644
--- a/thread_win32.c
+++ b/thread_win32.c
@@ -154,6 +154,7 @@ rb_thread_sched_init(struct rb_thread_sched *sched, bool atfork)
     sched->lock = w32_mutex_create();
 }
 
+#if 0
 // per-ractor
 void
 rb_thread_sched_destroy(struct rb_thread_sched *sched)
@@ -161,6 +162,7 @@ rb_thread_sched_destroy(struct rb_thread_sched *sched)
     if (GVL_DEBUG) fprintf(stderr, "sched destroy\n");
     CloseHandle(sched->lock);
 }
+#endif
 
 rb_thread_t *
 ruby_thread_from_native(void)
diff --git a/time.c b/time.c
index bef9a9e231..25098e7e76 100644
--- a/time.c
+++ b/time.c
@@ -2342,7 +2342,7 @@ zone_timelocal(VALUE zone, VALUE time)
     struct time_object *tobj = RTYPEDDATA_GET_DATA(time);
     wideval_t t, s;
 
-    split_second(tobj->timew, &t, &s);
+    wdivmod(tobj->timew, WINT2FIXWV(TIME_SCALE), &t, &s);
     tm = tm_from_time(rb_cTimeTM, time);
     utc = rb_check_funcall(zone, id_local_to_utc, 1, &tm);
     if (UNDEF_P(utc)) return 0;
diff --git a/version.h b/version.h
index adc09297e8..e84e068724 100644
--- a/version.h
+++ b/version.h
@@ -11,7 +11,7 @@
 # define RUBY_VERSION_MINOR RUBY_API_VERSION_MINOR
 #define RUBY_VERSION_TEENY 2
 #define RUBY_RELEASE_DATE RUBY_RELEASE_YEAR_STR"-"RUBY_RELEASE_MONTH_STR"-"RUBY_RELEASE_DAY_STR
-#define RUBY_PATCHLEVEL 78
+#define RUBY_PATCHLEVEL 79
 
 #include "ruby/version.h"
 #include "ruby/internal/abi.h"