From 342f72e747369c19f041e4169d93b3283dbe15a9 Mon Sep 17 00:00:00 2001
From: Andrew Childs <lorne@cons.org.nz>
Date: Sun, 15 Jul 2018 14:41:45 +0900
Subject: [PATCH] ffmpeg: fix includedir in pkg-config files

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

diff --git a/pkgs/development/libraries/ffmpeg/generic.nix b/pkgs/development/libraries/ffmpeg/generic.nix
index 762f306d69f9..bc70c5ab2371 100644
--- a/pkgs/development/libraries/ffmpeg/generic.nix
+++ b/pkgs/development/libraries/ffmpeg/generic.nix
@@ -170,9 +170,15 @@ stdenv.mkDerivation rec {
 
   doCheck = false; # fails
 
+  # ffmpeg 3+ generates pkg-config (.pc) files that don't have the
+  # form automatically handled by the multiple-outputs hooks.
   postFixup = ''
     moveToOutput bin "$bin"
     moveToOutput share/ffmpeg/examples "$doc"
+    for pc in ''${!outputDev}/lib/pkgconfig/*.pc; do
+      substituteInPlace $pc \
+        --replace "includedir=$out" "includedir=''${!outputInclude}"
+    done
   '';
 
   installFlags = [ "install-man" ];