From 8cf96b94264402e958908862991c281999483d3a Mon Sep 17 00:00:00 2001
From: oxalica <oxalicc@pm.me>
Date: Wed, 31 Mar 2021 23:56:38 +0800
Subject: [PATCH] stdenv: patch autoconf script for riscv in stage 2

---
 pkgs/stdenv/linux/default.nix | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/pkgs/stdenv/linux/default.nix b/pkgs/stdenv/linux/default.nix
index d2c74f7722d3843..b2b0dad82d82a7c 100644
--- a/pkgs/stdenv/linux/default.nix
+++ b/pkgs/stdenv/linux/default.nix
@@ -279,6 +279,10 @@ in
         };
       };
     };
+
+    # `libtool` comes with obsolete config.sub/config.guess that don't recognize Risc-V.
+    extraNativeBuildInputs =
+      lib.optional (localSystem.isRiscV) prevStage.updateAutotoolsGnuConfigScriptsHook;
   })