From be41f703ad192f71ef9cb200a5b41c7c9db89971 Mon Sep 17 00:00:00 2001
From: Ben Wolsieffer <benwolsieffer@gmail.com>
Date: Sat, 29 Feb 2020 15:26:43 -0500
Subject: [PATCH] libyamlcpp: actually build shared libraries (#81051)

---
 pkgs/development/libraries/libyaml-cpp/default.nix | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/pkgs/development/libraries/libyaml-cpp/default.nix b/pkgs/development/libraries/libyaml-cpp/default.nix
index 3d0a94a35d0b..cf880ef1e16c 100644
--- a/pkgs/development/libraries/libyaml-cpp/default.nix
+++ b/pkgs/development/libraries/libyaml-cpp/default.nix
@@ -11,6 +11,13 @@ stdenv.mkDerivation rec {
     sha256 = "0ykkxzxcwwiv8l8r697gyqh1nl582krpvi7m7l6b40ijnk4pw30s";
   };
 
+  # implement https://github.com/jbeder/yaml-cpp/commit/52a1378e48e15d42a0b755af7146394c6eff998c
+  postPatch = ''
+    substituteInPlace CMakeLists.txt \
+      --replace 'option(YAML_BUILD_SHARED_LIBS "Build Shared Libraries" OFF)' \
+                'option(YAML_BUILD_SHARED_LIBS "Build yaml-cpp shared library" ''${BUILD_SHARED_LIBS})'
+  '';
+
   nativeBuildInputs = [ cmake ];
 
   cmakeFlags = [ "-DBUILD_SHARED_LIBS=ON" "-DYAML_CPP_BUILD_TESTS=OFF" ];