https://git.ruby-lang.org/ruby.git/commit/?id=e79b42c9b2

From e79b42c9b21abbd73aa97aec21f817704d37fd7d Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@r...>
Date: Fri, 19 Mar 2021 12:32:33 +0900
Subject: configure.ac: don't use pthread_sigmask in emscripten

---
 configure.ac | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index b5b2397..0110896 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2566,7 +2566,8 @@ AS_IF([test x"$enable_pthread" = xyes], [ https://github.com/ruby/ruby/blob/trunk/configure.ac#L2566
 	pthread_get_stackaddr_np pthread_get_stacksize_np \
 	thr_stksegment pthread_stackseg_np pthread_getthrds_np \
 	pthread_condattr_setclock \
-	pthread_sigmask pthread_setname_np pthread_set_name_np)
+	pthread_setname_np pthread_set_name_np)
+    AS_CASE(["$target_os"],[emscripten*],[ac_cv_func_pthread_sigmask=no],[AC_CHECK_FUNCS(pthread_sigmask)])
     AS_CASE(["$target_os"],[aix*],[ac_cv_func_pthread_getattr_np=no],[AC_CHECK_FUNCS(pthread_getattr_np)])
     set_current_thread_name=
     AS_IF([test "$ac_cv_func_pthread_setname_np" = yes], [
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