From 6cc8869f383a242c4c995e9c158cc03d5b2c5170 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Vladim=C3=ADr=20=C4=8Cun=C3=A1t?= <vcunat@gmail.com>
Date: Thu, 28 May 2015 13:14:37 +0200
Subject: [PATCH] fltk13: fix a bug preventing use in octave

Fixes #8007 (together with the parent commit).
---
 pkgs/development/libraries/fltk/fltk13.nix | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/pkgs/development/libraries/fltk/fltk13.nix b/pkgs/development/libraries/fltk/fltk13.nix
index 262ef8b865e..a5b65f09e61 100644
--- a/pkgs/development/libraries/fltk/fltk13.nix
+++ b/pkgs/development/libraries/fltk/fltk13.nix
@@ -15,6 +15,12 @@ composableDerivation.composableDerivation {} {
     sha256 = "15qd7lkz5d5ynz70xhxhigpz3wns39v9xcf7ggkl0792syc8sfgq";
   };
 
+  # http://www.fltk.org/str.php?L3156
+  postPatch = ''
+    substituteInPlace FL/x.H \
+      --replace 'class Fl_XFont_On_Demand' 'class FL_EXPORT Fl_XFont_On_Demand'
+  '';
+
   propagatedBuildInputs = [ x11 inputproto libXi freeglut ];
 
   enableParallelBilding = true;