From 74e20c9b27b948ff548955f0e82ba2332cba85b8 Mon Sep 17 00:00:00 2001
From: oxalica <oxalicc@pm.me>
Date: Sat, 27 Feb 2021 11:06:21 +0800
Subject: [PATCH] boost: fix cross-compile support

---
 pkgs/development/libraries/boost/generic.nix | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/pkgs/development/libraries/boost/generic.nix b/pkgs/development/libraries/boost/generic.nix
index 422c1d7b391..6158eb87511 100644
--- a/pkgs/development/libraries/boost/generic.nix
+++ b/pkgs/development/libraries/boost/generic.nix
@@ -150,6 +150,9 @@ stdenv.mkDerivation {
     cat << EOF >> user-config.jam
     using gcc : cross : ${stdenv.cc.targetPrefix}c++ ;
     EOF
+    # Build b2 with buildPlatform CC/CXX.
+    sed '2i export CC=$CC_FOR_BUILD; export CXX=$CXX_FOR_BUILD' \
+      -i ./tools/build/src/engine/build.sh
   '';
 
   NIX_CFLAGS_LINK = lib.optionalString stdenv.isDarwin