From 2f6997fa92bc4ae6f8eaf2ea4329479e709324ce Mon Sep 17 00:00:00 2001
From: "Alexander V. Nikolaev" <avn@avnik.info>
Date: Tue, 7 May 2024 19:16:30 +0300
Subject: [PATCH] python-m2crypto: fix cross-compilation

---
 pkgs/development/python-modules/m2crypto/default.nix | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/pkgs/development/python-modules/m2crypto/default.nix b/pkgs/development/python-modules/m2crypto/default.nix
index ae2e7b87ded1..00d23b854030 100644
--- a/pkgs/development/python-modules/m2crypto/default.nix
+++ b/pkgs/development/python-modules/m2crypto/default.nix
@@ -32,10 +32,14 @@ buildPythonPackage rec {
     parameterized
   ];
 
-  env.NIX_CFLAGS_COMPILE = lib.optionalString stdenv.isDarwin (toString [
-    "-Wno-error=implicit-function-declaration"
-    "-Wno-error=incompatible-pointer-types"
-  ]);
+  env = {
+    NIX_CFLAGS_COMPILE = lib.optionalString stdenv.isDarwin (toString [
+      "-Wno-error=implicit-function-declaration"
+      "-Wno-error=incompatible-pointer-types"
+    ]);
+  } // lib.optionalAttrs (stdenv.hostPlatform != stdenv.buildPlatform) {
+    CPP = "${stdenv.cc.targetPrefix}cpp";
+  };
 
   nativeCheckInputs = [
     pytestCheckHook