From 9d1b1aa7b9cef1fa7de7d1aac4b06c5dfa718573 Mon Sep 17 00:00:00 2001
From: Emily <vcs@emily.moe>
Date: Mon, 8 Sep 2025 02:39:38 +0100
Subject: [PATCH] =?UTF-8?q?haskellPackages.spaceprobe:=20don=E2=80=99t=20f?=
 =?UTF-8?q?orce=20the=20LLVM=20backend?=
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---
 pkgs/development/haskell-modules/configuration-nix.nix | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/pkgs/development/haskell-modules/configuration-nix.nix b/pkgs/development/haskell-modules/configuration-nix.nix
index d08240cacf56..cf9dd3c715f5 100644
--- a/pkgs/development/haskell-modules/configuration-nix.nix
+++ b/pkgs/development/haskell-modules/configuration-nix.nix
@@ -523,8 +523,14 @@ builtins.intersectAttrs super {
       )
     );
 
-  # Needs help finding LLVM.
-  spaceprobe = addBuildTool self.buildHaskellPackages.llvmPackages.llvm super.spaceprobe;
+  # Forces the LLVM backend; upstream signalled intent to remove this
+  # in 2017: <https://github.com/SeanRBurton/spaceprobe/issues/1>.
+  spaceprobe = overrideCabal (drv: {
+    postPatch = ''
+      substituteInPlace spaceprobe.cabal \
+        --replace-fail '-fllvm ' ""
+    '';
+  }) super.spaceprobe;
 
   # Tries to run GUI in tests
   leksah = dontCheck (