From 0b67d9e87aea54ea13b4f5031a5b58676834ff4a Mon Sep 17 00:00:00 2001
From: Robert Scott <code@humanleg.org.uk>
Date: Sat, 19 Sep 2020 22:48:51 +0100
Subject: [PATCH] birdfont: fix build on non-nixos/debian systems

to do this we need to prevent platform.version() from using uname to
discover this is a debian kernel and try dpkg nonsense
---
 pkgs/tools/misc/birdfont/default.nix | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/pkgs/tools/misc/birdfont/default.nix b/pkgs/tools/misc/birdfont/default.nix
index bdf68d708a5..7cec0cab996 100644
--- a/pkgs/tools/misc/birdfont/default.nix
+++ b/pkgs/tools/misc/birdfont/default.nix
@@ -14,7 +14,12 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ python3 pkgconfig vala_0_44 gobject-introspection wrapGAppsHook ];
   buildInputs = [ xmlbird libgee cairo gdk-pixbuf glib gtk3 webkitgtk libnotify sqlite gsettings-desktop-schemas ];
 
-  postPatch = "patchShebangs .";
+  postPatch = ''
+    substituteInPlace install.py \
+      --replace 'platform.version()' '"Nix"'
+
+    patchShebangs .
+  '';
 
   buildPhase = "./build.py";