From 3584f1d6d4ec665d8e6572e1706761612777dc71 Mon Sep 17 00:00:00 2001
From: Willi Butz <wbutz@cyberfnord.de>
Date: Sat, 12 Aug 2017 00:38:32 +0200
Subject: [PATCH] primecoin: fix build

---
 pkgs/applications/altcoins/primecoin.nix | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/pkgs/applications/altcoins/primecoin.nix b/pkgs/applications/altcoins/primecoin.nix
index 31183670212..e6ed05dd27f 100644
--- a/pkgs/applications/altcoins/primecoin.nix
+++ b/pkgs/applications/altcoins/primecoin.nix
@@ -22,7 +22,8 @@ stdenv.mkDerivation rec{
   configureFlags = [ "--with-boost-libdir=${boost.out}/lib" ]
                      ++ optionals withGui [ "--with-gui=qt4" ];
 
-  preBuild = optional (!withGui) "cd src; cp makefile.unix Makefile";
+  preBuild = "unset AR;"
+              + (toString (optional (!withGui) "cd src; cp makefile.unix Makefile"));
 
   installPhase =
     if withGui