From 3925a35d86afa37405290ba59a42442643b3b69f Mon Sep 17 00:00:00 2001
From: Randy Eckenrode <randy@largeandhighquality.com>
Date: Wed, 8 Nov 2023 18:21:00 -0500
Subject: [PATCH] lftp: fix build with clang 16

The `configure` script fails to detect several C standard library
functions due to not including the required headers. Suppressing the
warning about implicit function declarations allows the checks to
succeed and lftp build.
---
 pkgs/tools/networking/lftp/default.nix | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/pkgs/tools/networking/lftp/default.nix b/pkgs/tools/networking/lftp/default.nix
index aaa26a38c3ae..637214809d41 100644
--- a/pkgs/tools/networking/lftp/default.nix
+++ b/pkgs/tools/networking/lftp/default.nix
@@ -18,6 +18,11 @@ stdenv.mkDerivation rec {
 
   hardeningDisable = lib.optional stdenv.isDarwin "format";
 
+  env = lib.optionalAttrs stdenv.isDarwin {
+    # Required to build with clang 16 or `configure` will fail to detect several standard functions.
+    NIX_CFLAGS_COMPILE = "-Wno-error=implicit-function-declaration";
+  };
+
   configureFlags = [
     "--with-openssl"
     "--with-readline=${readline.dev}"