From ecaa14186f2d6a9f659b6951fc0825fc7df883ab Mon Sep 17 00:00:00 2001
From: Evgeny Kurnevsky <kurnevsky@gmail.com>
Date: Wed, 20 Aug 2025 15:21:03 -0400
Subject: [PATCH] vtk: add vtk-dicom module

---
 pkgs/development/libraries/vtk/generic.nix | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/pkgs/development/libraries/vtk/generic.nix b/pkgs/development/libraries/vtk/generic.nix
index a0f4d42a5a13..ac9b3aabec17 100644
--- a/pkgs/development/libraries/vtk/generic.nix
+++ b/pkgs/development/libraries/vtk/generic.nix
@@ -8,6 +8,7 @@
   newScope,
   stdenv,
   fetchurl,
+  fetchFromGitHub,
   cmake,
   pkg-config,
 
@@ -46,6 +47,7 @@
   libgeotiff,
   laszip_2,
   gdal,
+  gdcm,
   pdal,
   alembic,
   imath,
@@ -136,6 +138,19 @@ stdenv.mkDerivation (finalAttrs: {
     hash = sourceSha256;
   };
 
+  postPatch =
+    let
+      vtk-dicom = fetchFromGitHub {
+        owner = "dgobbi";
+        repo = "vtk-dicom";
+        tag = "v0.8.17";
+        hash = "sha256-1lI2qsV4gymWqjeouEHZ5FRlmlh9vimH7J5rzA+eOds=";
+      };
+    in
+    ''
+      cp --no-preserve=mode -r ${vtk-dicom} ./Remote/vtkDICOM
+    '';
+
   nativeBuildInputs = [
     cmake
     pkg-config # required for finding MySQl
@@ -153,6 +168,7 @@ stdenv.mkDerivation (finalAttrs: {
     libgeotiff
     laszip_2
     gdal
+    (gdcm.override { enableVTK = false; })
     pdal
     alembic
     imath
@@ -289,6 +305,9 @@ stdenv.mkDerivation (finalAttrs: {
     # mpiSupport
     (lib.cmakeBool "VTK_USE_MPI" mpiSupport)
     (vtkBool "VTK_GROUP_ENABLE_MPI" mpiSupport)
+
+    # Remote module options
+    (lib.cmakeBool "USE_GDCM" true) # for vtkDicom
   ];
 
   pythonImportsCheck = [ "vtk" ];