From 8f5eaa6debf01eb3c2bdf0888b3ee3ac1c68aca9 Mon Sep 17 00:00:00 2001
From: Alyssa Ross <hi@alyssa.is>
Date: Thu, 16 Jul 2020 21:59:20 +0000
Subject: [PATCH] gfan: fix clang build on non-Darwin

-fno-guess-branch-probability isn't a Darwin-specific thing, it's a
clang-specific thing.
---
 pkgs/applications/science/math/gfan/default.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/applications/science/math/gfan/default.nix b/pkgs/applications/science/math/gfan/default.nix
index 72d1a548c53..adac92f376c 100644
--- a/pkgs/applications/science/math/gfan/default.nix
+++ b/pkgs/applications/science/math/gfan/default.nix
@@ -8,7 +8,7 @@ stdenv.mkDerivation rec {
     sha256 = "02pihqb1lb76a0xbfwjzs1cd6ay3ldfxsm8dvsbl6qs3vkjxax56";
   };
 
-  patchPhase = stdenv.lib.optionalString stdenv.isDarwin ''
+  patchPhase = stdenv.lib.optionalString stdenv.cc.isClang ''
     substituteInPlace Makefile --replace "-fno-guess-branch-probability" ""
   '';