https://git.ruby-lang.org/ruby.git/commit/?id=c3244a3574

From c3244a3574da8ddc35523ef1b882dd2aadfc2818 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Fri, 22 Jan 2021 22:29:17 +0900
Subject: Do not set target_alias if unset


diff --git a/configure.ac b/configure.ac
index 90d08fc..65afe5a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -83,9 +83,9 @@ AC_CANONICAL_TARGET https://github.com/ruby/ruby/blob/trunk/configure.ac#L83
 AS_CASE(["$target_cpu-$target_os"],
     [aarch64-darwin*], [
         target_cpu=arm64
-        AS_CASE(["$target_vendor"], [unknown], [target_vendor=apple])
-        target="$target_cpu-$target_vendor-$target_os"
-        target_alias="$target_cpu-$target_os"
+        AS_CASE(["$target_vendor"], [unknown], [target_vendor=apple target=${target/-unknown-/-apple-}])
+        target="${target/aarch64/arm64}"
+        target_alias="${target_alias/aarch64/arm64}"
     ])
 
 AC_ARG_PROGRAM
-- 
cgit v0.10.2


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