https://git.ruby-lang.org/ruby.git/commit/?id=33fb87cc9c

From 33fb87cc9c1218463c54b0277f635318c1509629 Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@r...>
Date: Sat, 23 Jan 2021 13:22:56 +0900
Subject: io.c: popen is not available on emscripten

---
 io.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/io.c b/io.c
index 5166739..2466cea 100644
--- a/io.c
+++ b/io.c
@@ -6647,6 +6647,7 @@ rb_execarg_fixup_v(VALUE execarg_obj) https://github.com/ruby/ruby/blob/trunk/io.c#L6647
 char *rb_execarg_commandline(const struct rb_execarg *eargp, VALUE *prog);
 #endif
 
+#ifndef __EMSCRIPTEN__
 static VALUE
 pipe_open(VALUE execarg_obj, const char *modestr, int fmode,
 	  const convconfig_t *convconfig)
@@ -6876,6 +6877,14 @@ pipe_open(VALUE execarg_obj, const char *modestr, int fmode, https://github.com/ruby/ruby/blob/trunk/io.c#L6877
 #endif
     return port;
 }
+#else
+static VALUE
+pipe_open(VALUE execarg_obj, const char *modestr, int fmode,
+	  const convconfig_t *convconfig)
+{
+    rb_raise(rb_eNotImpError, "popen() is not available");
+}
+#endif
 
 static int
 is_popen_fork(VALUE prog)
-- 
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