https://git.ruby-lang.org/ruby.git/commit/?id=df31fa4a51

From df31fa4a51822faccb35aa7a253c8af015869d0c Mon Sep 17 00:00:00 2001
From: Yuta Saito <kateinoigakukun@g...>
Date: Thu, 9 Dec 2021 12:44:45 +0900
Subject: [wasm] configure.ac: don't require dup and dup2 only for wasi

---
 configure.ac | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 2696d6e76c2..e20e133feb6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1930,7 +1930,14 @@ AC_DEFUN([RUBY_REQUIRE_FUNC], [ https://github.com/ruby/ruby/blob/trunk/configure.ac#L1930
     AS_IF([test "$ac_cv_func_[]AS_TR_SH($1)" = yes], [],
           [AC_MSG_ERROR($1[() must be supported])])
 ])
-m4_map_args_w([dup dup2], [RUBY_REQUIRE_FUNC(], [)])
+
+# dup and dup2 are always available except for WASI
+AS_CASE(["$target_os"],
+    [wasi*], [],
+    [
+        m4_map_args_w([dup dup2], [RUBY_REQUIRE_FUNC(], [)])
+    ]
+)
 
 AC_REPLACE_FUNCS(acosh)
 AC_REPLACE_FUNCS(cbrt)
-- 
cgit v1.2.1


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