From 4363214bd7c13e7866f46a1b5ff98534b5be1226 Mon Sep 17 00:00:00 2001
From: Tadeo Kondrak <me@tadeo.ca>
Date: Tue, 25 Jun 2019 17:12:38 -0600
Subject: [PATCH] ffms: symlink vapoursynth plugin

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

diff --git a/pkgs/development/libraries/ffms/default.nix b/pkgs/development/libraries/ffms/default.nix
index 8a5a9705cb22..1ad861fc63d8 100644
--- a/pkgs/development/libraries/ffms/default.nix
+++ b/pkgs/development/libraries/ffms/default.nix
@@ -16,6 +16,13 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ pkgconfig ];
   buildInputs = [ zlib ffmpeg ];
 
+  # ffms includes a built-in vapoursynth plugin, see:
+  # https://github.com/FFMS/ffms2#avisynth-and-vapoursynth-plugin
+  postInstall = ''
+    mkdir $out/lib/vapoursynth
+    ln -s $out/lib/libffms2.so $out/lib/vapoursynth/libffms2.so
+  '';
+
   meta = with stdenv.lib; {
     homepage = https://github.com/FFMS/ffms2/;
     description = "Libav/ffmpeg based source library for easy frame accurate access";