From 88b848ca71a8561be457b3e83ace14e2cc7a6501 Mon Sep 17 00:00:00 2001
From: Dmitry Bogatov <kaction.cc@gmail.com>
Date: Sat, 28 Jun 2025 20:00:00 -0400
Subject: [PATCH] unzip: Fix build with gcc-15

---
 pkgs/by-name/un/unzip/package.nix | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/pkgs/by-name/un/unzip/package.nix b/pkgs/by-name/un/unzip/package.nix
index 7a2f8fc8bd33..ebcc3d27c351 100644
--- a/pkgs/by-name/un/unzip/package.nix
+++ b/pkgs/by-name/un/unzip/package.nix
@@ -86,6 +86,11 @@ stdenv.mkDerivation rec {
       sha256 = "67ab260ae6adf8e7c5eda2d1d7846929b43562943ec4aff629bd7018954058b1";
     });
 
+  # gcc-15 uses c23 standard, which removed non-prototype function declarations.
+  postPatch = ''
+    sed -i '/localtime()/ d' unix/unxcfg.h
+  '';
+
   nativeBuildInputs = [ bzip2 ];
   buildInputs = [ bzip2 ] ++ lib.optional enableNLS libnatspec;