From 15b2e4e73223d5a1a142f50e7a03e684dba43091 Mon Sep 17 00:00:00 2001
From: David McFarland <corngood@gmail.com>
Date: Sat, 13 Sep 2025 18:18:39 -0300
Subject: [PATCH] zstd: fix cygwin build

---
 pkgs/tools/compression/zstd/default.nix | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/pkgs/tools/compression/zstd/default.nix b/pkgs/tools/compression/zstd/default.nix
index 13da3b9f7de4..a014b652d313 100644
--- a/pkgs/tools/compression/zstd/default.nix
+++ b/pkgs/tools/compression/zstd/default.nix
@@ -111,6 +111,13 @@ stdenv.mkDerivation (finalAttrs: {
     ''
   );
 
+  # replace invalid symlinks when executable suffix is .exe
+  postInstall = lib.optionalString stdenv.hostPlatform.isCygwin ''
+    for link in unzstd zstdcat zstdmt; do
+      ln -sf zstd.exe $bin/bin/$link
+    done
+  '';
+
   outputs = [
     "bin"
     "dev"