[windows/compile_error] "FLANN issues flann/util/param.h" not found even tho its in the path

hi all ive tried installing pcl on windows. However the vcpkg is not suitaable due to issues with the vtk external package. when using the all one installer. I found an issues with flann. It cant find the flann dir. Hence why util pararms for kdtree are not usable.

Please refer to below log.

System Windows 10.
Compiler VS 19 for x64
PCL 1.11.1

Cmake
1>This warning is for project developers. Use -Wno-dev to suppress it.
1>
1>-- Configuring done
1>-- Generating done
1>-- Build files have been written to: C:/Users/esgaa/Desktop/UNI/uts/Capstone/Code/3D-Scanner/Segmentation/Poisson Reconstruction/out
2>------ Build started: Project: obj_converterer, Configuration: Debug x64 ------
2>loadmesh.cpp
2>C:\Program Files\PCL 1.11.1\include\pcl-1.11\pcl/kdtree/kdtree_flann.h(44,10): fatal error C1083: Cannot open include file: 'flann/util/params.h': No such file or directory
2>objimporter.cpp
2>C:\Program Files\PCL 1.11.1\3rdParty\Boost\include\boost-1_74\boost/function_output_iterator.hpp(14): message : This header is deprecated. Use <boost/iterator/function_output_iterator.hpp> instead.
2>C:\Program Files\PCL 1.11.1\include\pcl-1.11\pcl/io/low_level_io.h(73,16): warning C4996: '_open': This function or variable may be unsafe. Consider using _sopen_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
2>C:\Program Files\PCL 1.11.1\include\pcl-1.11\pcl/io/low_level_io.h(78,16): warning C4996: '_open': This function or variable may be unsafe. Consider using _sopen_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
2>C:\Program Files\PCL 1.11.1\include\pcl-1.11\pcl/kdtree/kdtree_flann.h(44,10): fatal error C1083: Cannot open include file: 'flann/util/params.h': No such file or directory
2>tester.cpp
2>C:\Program Files\PCL 1.11.1\include\pcl-1.11\pcl/kdtree/kdtree_flann.h(44,10): fatal error C1083: Cannot open include file: 'flann/util/params.h': No such file or directory
2>tester2.cpp
2>C:\Program Files\PCL 1.11.1\include\pcl-1.11\pcl/kdtree/kdtree_flann.h(44,10): fatal error C1083: Cannot open include file: 'flann/util/params.h': No such file or directory
2>tester3.cpp
2>C:\Program Files\PCL 1.11.1\include\pcl-1.11\pcl/kdtree/kdtree_flann.h(44,10): fatal error C1083: Cannot open include file: 'flann/util/params.h': No such file or directory
2>Generating Code...
2>Done building project "obj_converterer.vcxproj" -- FAILED.
3>------ Build started: Project: poisson, Configuration: Debug x64 ------
3>LINK : fatal error LNK1104: cannot open file 'Debug\obj_converterer.lib'
3>Done building project "poisson.vcxproj" -- FAILED.
4>------ Skipped Build: Project: ALL_BUILD, Configuration: Debug x64 ------
4>Project not selected to build for this solution configuration
========== Build: 1 succeeded, 2 failed, 0 up-to-date, 1 skipped ==========

Also everything i set the a diff path to find the flann dir. it keeps being reverted to not found.

Could you please let me know how to address this.

Regards,

Start with pcl/kdtree/kdtree_flann.h and the generated CMake/Visual Studio project, then inspect how the Windows installer exposes the FLANN include directory. Reproduce the PCL 1.11.1 build with Visual Studio 2019 on Windows 10; done means the project finds flann/util/params.h and the affected targets build successfully.