unfs3: fix build on gcc-14 (#389081)

pkgs/by-name/un/unfs3/package.nix

@@ -1,5 +1,6 @@
 {
   fetchFromGitHub,
+  fetchpatch2,
   lib,
   stdenv,
   flex,
@@ -7,6 +8,8 @@
   autoreconfHook,
   pkg-config,
   libtirpc,
+  versionCheckHook,
+  nix-update-script,
 }:
 
 stdenv.mkDerivation rec {
@@ -20,6 +23,14 @@ stdenv.mkDerivation rec {
     hash = "sha256-5iAriIutBhwyZVS7AG2fnkrHOI7pNAKfYv062Cy0WXw=";
   };
 
+  patches = [
+    # Fix implicit declaration warning with GCC 14
+    (fetchpatch2 {
+      url = "https://gitlab.alpinelinux.org/alpine/aports/-/raw/152dc14a65a89f253294cc5b4c96cf0d6658711a/main/unfs3/implicit.patch";
+      hash = "sha256-zrF87fJhc8mDgIs0vsMoqIHYQPtKWn2XMBSePvHOByA=";
+    })
+  ];
+
   nativeBuildInputs = [
     flex
     bison
@@ -33,6 +44,22 @@ stdenv.mkDerivation rec {
 
   doCheck = false; # no test suite
 
+  nativeInstallCheckInputs = [
+    versionCheckHook
+  ];
+  versionCheckProgram = "${placeholder "out"}/bin/unfsd";
+  versionCheckProgramArg = [ "-h" ];
+  doInstallCheck = true;
+
+  passthru = {
+    updateScript = nix-update-script {
+      extraArgs = [
+        "--version-regex"
+        "${pname}-(.*)"
+      ];
+    };
+  };
+
   meta = {
     description = "User-space NFSv3 file system server";