From 5a33e4477651fa56ebafbc52aaa75190e5a3afc6 Mon Sep 17 00:00:00 2001
From: Artur Cygan <arczicygan@gmail.com>
Date: Sat, 5 Dec 2020 02:13:54 +0100
Subject: [PATCH] libff: shared build on darwin

---
 pkgs/development/libraries/libff/default.nix | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/pkgs/development/libraries/libff/default.nix b/pkgs/development/libraries/libff/default.nix
index 8413d5be441..874f45cae70 100644
--- a/pkgs/development/libraries/libff/default.nix
+++ b/pkgs/development/libraries/libff/default.nix
@@ -14,6 +14,12 @@ stdenv.mkDerivation rec {
 
   cmakeFlags = [ "-DWITH_PROCPS=Off" ];
 
+  # CMake is hardcoded to always build static library which causes linker
+  # failure for Haskell applications depending on haskellPackages.hevm on macOS.
+  postPatch = stdenv.lib.optionalString stdenv.isDarwin ''
+    substituteInPlace libff/CMakeLists.txt --replace "STATIC" "SHARED"
+  '';
+
   nativeBuildInputs = [ cmake pkg-config ];
   buildInputs = [ boost gmp openssl ];