From 89dc517577cfc237b0c55a640b15294f0ab9900e Mon Sep 17 00:00:00 2001
From: Randy Eckenrode <randy@largeandhighquality.com>
Date: Mon, 14 Apr 2025 20:13:04 -0400
Subject: [PATCH] ocamlPackages.eigen: get libc++ headers on Darwin from
 stdenv.cc.libcxx

---
 pkgs/development/ocaml-modules/eigen/default.nix | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/pkgs/development/ocaml-modules/eigen/default.nix b/pkgs/development/ocaml-modules/eigen/default.nix
index 3dbe6315d5cd..73fd08fa6981 100644
--- a/pkgs/development/ocaml-modules/eigen/default.nix
+++ b/pkgs/development/ocaml-modules/eigen/default.nix
@@ -4,7 +4,6 @@
   buildDunePackage,
   fetchFromGitHub,
   ctypes,
-  libcxx,
 }:
 
 buildDunePackage rec {
@@ -22,7 +21,7 @@ buildDunePackage rec {
 
   minimalOCamlVersion = "4.02";
 
-  env.NIX_CFLAGS_COMPILE = lib.optionalString stdenv.hostPlatform.isDarwin "-I${lib.getDev libcxx}/include/c++/v1";
+  env.NIX_CFLAGS_COMPILE = lib.optionalString stdenv.hostPlatform.isDarwin "-I${lib.getInclude stdenv.cc.libcxx}/include/c++/v1";
 
   propagatedBuildInputs = [ ctypes ];