From 449fbec9be1865fca59e973f05dd06d213820c5e Mon Sep 17 00:00:00 2001
From: Will Dietz <w@wdtz.org>
Date: Mon, 25 Jun 2018 15:47:22 -0500
Subject: [PATCH] ghcHEAD: add musl and cross fixes recently applied to 8.4.3
 and 8.2.2

---
 pkgs/development/compilers/ghc/head.nix | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/pkgs/development/compilers/ghc/head.nix b/pkgs/development/compilers/ghc/head.nix
index 8ccd72ef55a..ec9ff56c458 100644
--- a/pkgs/development/compilers/ghc/head.nix
+++ b/pkgs/development/compilers/ghc/head.nix
@@ -50,7 +50,8 @@ let
   '' + stdenv.lib.optionalString enableIntegerSimple ''
     INTEGER_LIBRARY = integer-simple
   '' + stdenv.lib.optionalString (targetPlatform != hostPlatform) ''
-    Stage1Only = YES
+    Stage1Only = ${if targetPlatform.system == hostPlatform.system then "NO" else "YES"}
+    CrossCompilePrefix = ${targetPrefix}
     HADDOCK_DOCS = NO
     BUILD_SPHINX_HTML = NO
     BUILD_SPHINX_PDF = NO