From 034d565493b0383cb02800cf8449700e76dbc9bb Mon Sep 17 00:00:00 2001
From: Dmitry Kalinkin <dmitry.kalinkin@gmail.com>
Date: Tue, 9 Nov 2021 10:30:57 -0500
Subject: [PATCH] lhapdf: fix compilation with gccStdenv on darwin

This is used to compile against MCFM that is built with GCC
---
 pkgs/development/libraries/physics/lhapdf/default.nix | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/pkgs/development/libraries/physics/lhapdf/default.nix b/pkgs/development/libraries/physics/lhapdf/default.nix
index db185e299197..a3753d86356e 100644
--- a/pkgs/development/libraries/physics/lhapdf/default.nix
+++ b/pkgs/development/libraries/physics/lhapdf/default.nix
@@ -9,6 +9,12 @@ stdenv.mkDerivation rec {
     sha256 = "sha256-fS8CZ+LWWw3e4EhVOzQtfIk6bbq+HjJsrWLeABDdgQw=";
   };
 
+  # The Apple SDK only exports locale_t from xlocale.h whereas glibc
+  # had decided that xlocale.h should be a part of locale.h
+  postPatch = lib.optionalString (stdenv.isDarwin && stdenv.cc.isGNU) ''
+    substituteInPlace src/GridPDF.cc --replace '#include <locale>' '#include <xlocale.h>'
+  '';
+
   nativeBuildInputs = [ makeWrapper ];
   buildInputs = [ python ];