From a7a418b99f6b1848f1ee18628171e18d9a57f254 Mon Sep 17 00:00:00 2001
From: Emily Trau <emily@downunderctf.com>
Date: Wed, 29 Nov 2023 14:11:46 +1100
Subject: readline63: fix clang build

(cherry picked from commit d6d41d403c9821f863914a7903d778ca6264c84f)
---
 pkgs/development/libraries/readline/6.3.nix | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/pkgs/development/libraries/readline/6.3.nix b/pkgs/development/libraries/readline/6.3.nix
index 853078b5561c..aff16c3e4184 100644
--- a/pkgs/development/libraries/readline/6.3.nix
+++ b/pkgs/development/libraries/readline/6.3.nix
@@ -34,6 +34,10 @@ stdenv.mkDerivation {
      in
        import ./readline-6.3-patches.nix patch);
 
+  env = lib.optionalAttrs stdenv.cc.isClang {
+    NIX_CFLAGS_COMPILE = "-Wno-error=implicit-function-declaration";
+  };
+
   meta = with lib; {
     description = "Library for interactive line editing";
 
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