From e4b305ca703488204058b3a628ece974cf5befbd Mon Sep 17 00:00:00 2001
From: Danny Wilson <danny@prime.vc>
Date: Sat, 7 Nov 2015 05:59:34 +0100
Subject: [PATCH] Fix MPFR build again on SmartOS.

---
 pkgs/development/libraries/mpfr/default.nix | 1 +
 1 file changed, 1 insertion(+)

diff --git a/pkgs/development/libraries/mpfr/default.nix b/pkgs/development/libraries/mpfr/default.nix
index e1809d544d1..581f956b0af 100644
--- a/pkgs/development/libraries/mpfr/default.nix
+++ b/pkgs/development/libraries/mpfr/default.nix
@@ -14,6 +14,7 @@ stdenv.mkDerivation rec {
   propagatedBuildInputs = [ gmp ];
 
   configureFlags =
+    stdenv.lib.optional stdenv.isSunOS "--disable-thread-safe" ++
     stdenv.lib.optional stdenv.is64bit "--with-pic";
 
   doCheck = true;