From bd879d2bef70591766057da7927f89eeeeaf7078 Mon Sep 17 00:00:00 2001
From: Julien Dehos <dehos@univ-littoral.fr>
Date: Wed, 23 Aug 2017 16:41:16 +0200
Subject: [PATCH] eigen: fix configuration file for pkg-config

---
 pkgs/development/libraries/eigen/3.3.nix | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/pkgs/development/libraries/eigen/3.3.nix b/pkgs/development/libraries/eigen/3.3.nix
index 582b4fed9df9..94652b129345 100644
--- a/pkgs/development/libraries/eigen/3.3.nix
+++ b/pkgs/development/libraries/eigen/3.3.nix
@@ -13,7 +13,11 @@ stdenv.mkDerivation {
   };
   
   nativeBuildInputs = [ cmake ];
-  
+
+  postInstall = ''
+    sed -e '/Cflags:/s@''${prefix}/@@' -i "$out"/share/pkgconfig/eigen3.pc
+  '';
+   
   meta = with stdenv.lib; {
     description = "C++ template library for linear algebra: vectors, matrices, and related algorithms";
     license = licenses.lgpl3Plus;