From eef236d0ba205b061972d55926a45b593a4c3d13 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Vladim=C3=ADr=20=C4=8Cun=C3=A1t?= <vcunat@gmail.com>
Date: Sun, 27 Aug 2017 17:21:35 +0200
Subject: [PATCH] libsigsegv*: add an option to apply a patch

Close #28536; this code is a bit different in style for 2.5,
and avoids mass rebuild for the default version.
---
 pkgs/development/libraries/libsigsegv/2.5.nix     | 6 +++++-
 pkgs/development/libraries/libsigsegv/default.nix | 3 +++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/pkgs/development/libraries/libsigsegv/2.5.nix b/pkgs/development/libraries/libsigsegv/2.5.nix
index 0712ba92f60a..fd453defe713 100644
--- a/pkgs/development/libraries/libsigsegv/2.5.nix
+++ b/pkgs/development/libraries/libsigsegv/2.5.nix
@@ -1,4 +1,6 @@
-{ stdenv, fetchurl }:
+{ stdenv, fetchurl
+, enableSigbusFix ? false # required by kernels < 3.18.6
+}:
 
 stdenv.mkDerivation rec {
   name = "libsigsegv-2.5";
@@ -8,6 +10,8 @@ stdenv.mkDerivation rec {
     sha256 = "0fvcsq9msi63vrbpvks6mqkrnls5cfy6bzww063sqhk2h49vsyyg";
   };
 
+  patches = stdenv.lib.optional enableSigbusFix ./sigbus_fix.patch;
+
   meta = {
     homepage = http://libsigsegv.sf.net;
     description = "A library for handling page faults in user mode";
diff --git a/pkgs/development/libraries/libsigsegv/default.nix b/pkgs/development/libraries/libsigsegv/default.nix
index 961b3b2d883b..8e1079bfbc8a 100644
--- a/pkgs/development/libraries/libsigsegv/default.nix
+++ b/pkgs/development/libraries/libsigsegv/default.nix
@@ -1,5 +1,6 @@
 { stdenv, fetchurl
 , buildPlatform, hostPlatform
+, enableSigbusFix ? false # required by kernels < 3.18.6
 }:
 
 stdenv.mkDerivation rec {
@@ -10,6 +11,8 @@ stdenv.mkDerivation rec {
     sha256 = "063swdvq7mbmc1clv0rnh20grwln1zfc2qnm0sa1hivcxyr2wz6x";
   };
 
+  patches = if enableSigbusFix then [ ./sigbus_fix.patch ] else null;
+
   doCheck = hostPlatform == buildPlatform;
 
   meta = {