From 46c9b038115578838bb508918c1da6ca0accab09 Mon Sep 17 00:00:00 2001
From: David McFarland <corngood@gmail.com>
Date: Tue, 16 Dec 2025 13:46:50 -0400
Subject: [PATCH] libiconv: fix cygwin build

---
 pkgs/development/libraries/libiconv/default.nix | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/pkgs/development/libraries/libiconv/default.nix b/pkgs/development/libraries/libiconv/default.nix
index 8a166dfe0ea9..a7c3b193c9d0 100644
--- a/pkgs/development/libraries/libiconv/default.nix
+++ b/pkgs/development/libraries/libiconv/default.nix
@@ -76,7 +76,11 @@ stdenv.mkDerivation rec {
     (lib.enableFeature enableStatic "static")
     (lib.enableFeature enableShared "shared")
   ]
-  ++ lib.optional stdenv.hostPlatform.isFreeBSD "--with-pic";
+  ++ lib.optional stdenv.hostPlatform.isFreeBSD "--with-pic"
+  # Work around build failure caused by the gnulib workaround for
+  # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114870.
+  # remove after gnulib is updated
+  ++ lib.optional stdenv.hostPlatform.isCygwin "gl_cv_clean_version_stddef=yes";
 
   passthru = { inherit setupHooks; };