From ceeca752ea6af0c14c2796aee1dd720191fbdc97 Mon Sep 17 00:00:00 2001
From: Bruno Postle <bruno@postle.net>
Date: Tue, 25 Nov 2025 18:44:32 +0000
Subject: [PATCH] Fix build error from OCC with VTK support

OpenCASCADE may be built with VTK support. Try to find VTK first to avoid
CMake errors when OpenCASCADE's config references VTK targets.
---
 cmake/FindOpenCASCADE.cmake | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/cmake/FindOpenCASCADE.cmake b/cmake/FindOpenCASCADE.cmake
index e6e5cb4b96..74268a7b5a 100644
--- a/cmake/FindOpenCASCADE.cmake
+++ b/cmake/FindOpenCASCADE.cmake
@@ -12,6 +12,10 @@
 UNIFY_ENVVARS_AND_CACHE(OCC_INCLUDE_DIR)
 UNIFY_ENVVARS_AND_CACHE(OCC_LIBRARY_DIR)
 
+# OpenCASCADE may be built with VTK support. Try to find VTK first to avoid
+# CMake errors when OpenCASCADE's config references VTK targets.
+find_package(VTK QUIET)
+
 if(OCC_INCLUDE_DIR)
     set(OCC_INCLUDE_DIR ${OCC_INCLUDE_DIR} CACHE FILEPATH "Open CASCADE header files")
     message(STATUS "Looking for Open CASCADE include files in: ${OCC_INCLUDE_DIR}")