From bc30be8ce6f7ff2160d302dfac8bee47e1861d09 Mon Sep 17 00:00:00 2001
From: Weijia Wang <9713184+wegank@users.noreply.github.com>
Date: Fri, 3 Nov 2023 16:39:26 +0100
Subject: [PATCH] netpbm: fix build with clang 16

---
 pkgs/tools/graphics/netpbm/default.nix | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/pkgs/tools/graphics/netpbm/default.nix b/pkgs/tools/graphics/netpbm/default.nix
index 69af8d86b679..e93e485979ae 100644
--- a/pkgs/tools/graphics/netpbm/default.nix
+++ b/pkgs/tools/graphics/netpbm/default.nix
@@ -95,6 +95,10 @@ stdenv.mkDerivation {
     runHook postConfigure
   '';
 
+  env = lib.optionalAttrs stdenv.cc.isClang {
+    NIX_CFLAGS_COMPILE = "-Wno-implicit-function-declaration";
+  };
+
   installPhase = ''
     runHook preInstall