From 492cc1d81eff6673aae527493e7d6da35f20e81d Mon Sep 17 00:00:00 2001
From: Elis Hirwing <elis@hirwing.se>
Date: Sat, 30 Nov 2024 12:42:02 +0100
Subject: [PATCH] opencascade-occt: Build with rapidjson to enable glTF export
 in FreeCAD

This is to enable glTF export support in FreeCAD. FreeCAD depends on
the JSON support in OpenCascade to be able to export to
glTF (https://forum.freecad.org/viewtopic.php?t=63440).

And it turns out that OpenCascade doesn't default to having this
enabled by default:
https://dev.opencascade.org/content/building-linux-rapidjson
---
 pkgs/by-name/op/opencascade-occt/package.nix | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/pkgs/by-name/op/opencascade-occt/package.nix b/pkgs/by-name/op/opencascade-occt/package.nix
index 85ee2f4d1683..293eac8660b2 100644
--- a/pkgs/by-name/op/opencascade-occt/package.nix
+++ b/pkgs/by-name/op/opencascade-occt/package.nix
@@ -5,6 +5,7 @@
   fetchpatch,
   cmake,
   ninja,
+  rapidjson,
   tcl,
   tk,
   libGL,
@@ -48,9 +49,11 @@ stdenv.mkDerivation rec {
     libXext
     libXmu
     libXi
+    rapidjson
   ] ++ lib.optional stdenv.hostPlatform.isDarwin darwin.apple_sdk.frameworks.Cocoa;
 
   NIX_CFLAGS_COMPILE = [ "-fpermissive" ];
+  cmakeFlags = [ "-DUSE_RAPIDJSON=ON" ];
 
   meta = with lib; {
     description = "Open CASCADE Technology, libraries for 3D modeling and numerical simulation";