https://git.ruby-lang.org/ruby.git/commit/?id=8df25214de

From 8df25214de1a240ec6859415692b29955d2d423a Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@r...>
Date: Tue, 20 Aug 2019 00:17:26 +0900
Subject: io.c: make ioctl_req_t int in Android

The second argument of ioctl seems to be int in Android.
Android is not a supported platform, but this one-line change allows
ruby to build by Android NDK r20.

diff --git a/io.c b/io.c
index 19ce45c..e918f1c 100644
--- a/io.c
+++ b/io.c
@@ -9560,7 +9560,7 @@ rb_f_select(int argc, VALUE *argv, VALUE obj) https://github.com/ruby/ruby/blob/trunk/io.c#L9560
     return rb_ensure(select_call, (VALUE)&args, select_end, (VALUE)&args);
 }
 
-#if defined(__linux__) || defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__APPLE__)
+#if (defined(__linux__) && !defined(__ANDROID__)) || defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__APPLE__)
  typedef unsigned long ioctl_req_t;
 # define NUM2IOCTLREQ(num) NUM2ULONG(num)
 #else
-- 
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