diff '--color=auto' -ur onnxruntime-1.21.0.orig/cmake/external/onnxruntime_external_deps.cmake onnxruntime-1.21.0/cmake/external/onnxruntime_external_deps.cmake
--- onnxruntime-1.21.0.orig/cmake/external/onnxruntime_external_deps.cmake	2025-03-08 15:26:26.301686624 +0100
+++ onnxruntime-1.21.0/cmake/external/onnxruntime_external_deps.cmake	2025-03-08 15:38:38.179978791 +0100
@@ -527,7 +527,7 @@
   message(STATUS "Aliasing ONNX::onnx_proto to onnx_proto")
   add_library(onnx_proto ALIAS ONNX::onnx_proto)
 endif()
-if(onnxruntime_USE_VCPKG)
+if(onnxruntime_USE_PREINSTALLED_EIGEN)
   find_package(Eigen3 CONFIG REQUIRED)
 else()
   include(external/eigen.cmake)