From 507a64cd8da1647cd801ab01e1b95b4d6b43842e Mon Sep 17 00:00:00 2001
From: John Ericson <John.Ericson@Obsidian.Systems>
Date: Thu, 10 May 2018 12:42:43 -0400
Subject: [PATCH] libmsgpack: Remove crossAttrs

Just set cmakeFlags directly. Also improve conditions.
---
 pkgs/development/libraries/libmsgpack/generic.nix | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/pkgs/development/libraries/libmsgpack/generic.nix b/pkgs/development/libraries/libmsgpack/generic.nix
index 889ef134773..947960d2359 100644
--- a/pkgs/development/libraries/libmsgpack/generic.nix
+++ b/pkgs/development/libraries/libmsgpack/generic.nix
@@ -13,13 +13,12 @@ stdenv.mkDerivation rec {
 
   enableParallelBuilding = true;
 
-  crossAttrs = {
-  } // stdenv.lib.optionalAttrs (hostPlatform.libc == "msvcrt") {
-    cmakeFlags = [
-      "-DMSGPACK_BUILD_EXAMPLES=OFF"
-      "-DCMAKE_SYSTEM_NAME=Windows"
-    ];
-  };
+  cmakeFlags = []
+    ++ stdenv.lib.optional (stdenv.hostPlatform != stdenv.buildPlatform)
+                           "-DMSGPACK_BUILD_EXAMPLES=OFF"
+    ++ stdenv.lib.optional (hostPlatform.libc == "msvcrt")
+                           "-DCMAKE_SYSTEM_NAME=Windows"
+    ;
 
   meta = with stdenv.lib; {
     description = "MessagePack implementation for C and C++";