From aa0e8072a57e879073cee969a780e586dbe57997 Mon Sep 17 00:00:00 2001
From: Robert Scott <code@humanleg.org.uk>
Date: Fri, 12 Nov 2021 23:52:43 +0000
Subject: [PATCH] ogre: fix for aarch64

---
 pkgs/development/libraries/ogre/default.nix | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/pkgs/development/libraries/ogre/default.nix b/pkgs/development/libraries/ogre/default.nix
index d097dc623e76..26bab3799c89 100644
--- a/pkgs/development/libraries/ogre/default.nix
+++ b/pkgs/development/libraries/ogre/default.nix
@@ -19,6 +19,14 @@ stdenv.mkDerivation rec {
      sha256 = "1iv6k0dwdzg5nnzw2mcgcl663q4f7p2kj7nhs8afnsikrzxxgsi4";
   };
 
+  # fix for ARM. sys/sysctl.h has moved in later glibcs, and
+  # https://github.com/OGRECave/ogre-next/issues/132 suggests it isn't
+  # needed anyway.
+  postPatch = ''
+    substituteInPlace OgreMain/src/OgrePlatformInformation.cpp \
+      --replace '#include <sys/sysctl.h>' ""
+  '';
+
   cmakeFlags = [ "-DOGRE_BUILD_DEPENDENCIES=OFF" "-DOGRE_BUILD_SAMPLES=${toString withSamples}" ]
     ++ map (x: "-DOGRE_BUILD_PLUGIN_${x}=on")
            ([ "BSP" "OCTREE" "PCZ" "PFX" ] ++ lib.optional withNvidiaCg "CG")