From 23f75822bd61ba518421641c92d8112f3fa2b599 Mon Sep 17 00:00:00 2001
From: sempiternal-aurora
 <78790545+sempiternal-aurora@users.noreply.github.com>
Date: Sun, 19 Apr 2026 23:44:38 +1000
Subject: [PATCH] polyml: Fix polyc linking script

polyc linking script hardcodes the linker to be the value of `$CXX` at
compile time. This is bad for environments without `g++` in path. Fix
this by patching the correct path into the script.

Co-Authored-By: Ricardo Correia <someplaceguy@wizy.org>
Co-Authored-By: Ivan Trubach <mr.trubach@icloud.com>
(cherry picked from commit 3a717e7522076b62cc6a9f49551cd82acb79e8bc)
---
 pkgs/by-name/po/polyml/package.nix | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/pkgs/by-name/po/polyml/package.nix b/pkgs/by-name/po/polyml/package.nix
index d8f6aff45d7f..18674635298b 100644
--- a/pkgs/by-name/po/polyml/package.nix
+++ b/pkgs/by-name/po/polyml/package.nix
@@ -1,6 +1,7 @@
 {
   lib,
   stdenv,
+  pkgsHostTarget,
   fetchFromGitHub,
   autoreconfHook,
   gmp,
@@ -35,6 +36,7 @@ stdenv.mkDerivation (finalAttrs: {
   buildInputs = [
     libffi
     gmp
+    pkgsHostTarget.stdenv.cc
   ];
 
   nativeBuildInputs = [ autoreconfHook ];
@@ -45,6 +47,11 @@ stdenv.mkDerivation (finalAttrs: {
     "--with-gmp"
   ];
 
+  preInstall = ''
+    substituteInPlace polyc \
+      --replace-fail "LINK=\"$CXX\"" "LINK=\"${lib.getExe' pkgsHostTarget.stdenv.cc "c++"}\""
+  '';
+
   doCheck = true;
 
   meta = {