From 807b01da820ed3793b4a4545bf29cf14cc4c5801 Mon Sep 17 00:00:00 2001
From: lassulus <git@lassul.us>
Date: Sun, 11 Jan 2026 01:49:48 +0100
Subject: [PATCH] ucspi-tcp: fix build with GCC 14

Uses K&R C style function declarations (e.g., `extern int wait_nohang();`)
which GCC 14+ treats as `(void)`, causing 'too many arguments' errors.

Adding -std=gnu89 restores the pre-C23 behavior where empty parameter
lists mean unspecified parameters.
---
 pkgs/by-name/uc/ucspi-tcp/package.nix | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/pkgs/by-name/uc/ucspi-tcp/package.nix b/pkgs/by-name/uc/ucspi-tcp/package.nix
index d12828e15847..27dd43811476 100644
--- a/pkgs/by-name/uc/ucspi-tcp/package.nix
+++ b/pkgs/by-name/uc/ucspi-tcp/package.nix
@@ -10,6 +10,9 @@ stdenv.mkDerivation rec {
   pname = "ucspi-tcp";
   version = "0.88";
 
+  # Uses K&R C style function declarations which GCC 14+ rejects
+  env.NIX_CFLAGS_COMPILE = "-std=gnu89";
+
   src = fetchurl {
     url = "https://cr.yp.to/ucspi-tcp/ucspi-tcp-${version}.tar.gz";
     sha256 = "171yl9kfm8w7l17dfxild99mbf877a9k5zg8yysgb1j8nz51a1ja";