[C:\ITKRTK\ITK-Build\Wrapping\Modules\RTK\RTKPython.vcxproj]
C:\ITKRTK\ITK\Modules\Remote\RTK\include\rtkMechlemOneStepSpectralReconstructionFilter.hxx(438,23): error C2664: ]
[C:\ITKRTK\ITK-Build\Wrapping\Modules\RTK\RTKPython.vcxproj]
(compiling source file ‘../RTK/rtkMechlemOneStepSpectralReconstructionFilterPython.cpp’)
---
### Author:  [@simon.rit](https://discourse.itk.org/u/simon.rit)
#### Post date: [November 10, 2025, 11:48am UTC](https://discourse.itk.org/t/itk-rtk-config-and-build-to-use-cudabackprojectionimagefilter-python-wrapper/7658/4 "2025-11-10T11:48:48Z")
I don’t know what is the issue, sorry. Can you try to provide a complete log? The errors seem incomplete. Can you also confirm which version of ITK you’re using?
---
### Author:  [@jshenNT](https://discourse.itk.org/u/jshenNT)
#### Post date: [November 11, 2025, 4:31pm UTC](https://discourse.itk.org/t/itk-rtk-config-and-build-to-use-cudabackprojectionimagefilter-python-wrapper/7658/5 "2025-11-11T16:31:08Z")
Hi Simon,
For ITK, I used version **5.4.4**.
Attached are the log files:
- **CMakeOutput.log** and **CMakeError.log** (configuration logs)
- **build\_log.txt** (build log from command line redirect
Please let me know if you have any suggestions.
Thank you.
---
### Author:  [@simon.rit](https://discourse.itk.org/u/simon.rit)
#### Post date: [November 13, 2025, 3:15pm UTC](https://discourse.itk.org/t/itk-rtk-config-and-build-to-use-cudabackprojectionimagefilter-python-wrapper/7658/6 "2025-11-13T15:15:41Z")
I’m not sure I understand but you seem to compile with a mingw terminal? The compiler seems to believe you’re under unix (hence the unistd.h inclusion errors). Check that you’re using a visual studio terminal, which can also be obtained by running cmd.exe and then
```auto
call “c:\Program Files (x86)\Microsoft Visual Studio\2022\Community\VC\Auxiliary\Build\vcvars64.bat”
```
---
### Author:  [@jshenNT](https://discourse.itk.org/u/jshenNT)
#### Post date: [November 15, 2025, 1:22am UTC](https://discourse.itk.org/t/itk-rtk-config-and-build-to-use-cudabackprojectionimagefilter-python-wrapper/7658/7 "2025-11-15T01:22:23Z")
Hi Simon,
I don’t have a MinGW terminal, only the standard command line for configuring and building. Still, I tried your suggestion using a Visual Studio Developer Command Prompt and ran the config and build steps. As far as I can tell, I’m seeing the same behavior and the same errors. Do you have any other suggestions?
Thanks
---
### Author:  [@simon.rit](https://discourse.itk.org/u/simon.rit)
#### Post date: [November 15, 2025, 10:03pm UTC](https://discourse.itk.org/t/itk-rtk-config-and-build-to-use-cudabackprojectionimagefilter-python-wrapper/7658/8 "2025-11-15T22:03:31Z")
Not really. From the log, I see that the compiler has `/D VXL_HAS_MINGW_ALIGNED_MALLOC`. This is triggered from [here](https://github.com/InsightSoftwareConsortium/ITK/blob/main/Modules/ThirdParty/VNL/src/vxl/config/cmake/config/VXLIntrospectionConfig.cmake#L460). When executing `CMake` for the first time, you probably see
```auto
-- Performing Test VXL_HAS_MINGW_ALIGNED_MALLOC
-- Performing Test VXL_HAS_MINGW_ALIGNED_MALLOC - Success
```
Maybe try to understand why the test succeeds at CMake configuration but the compilation fails later? You can also try to manually turn `VXL_HAS_MINGW_ALIGNED_MALLOC` to `OFF` in the `CMakeCache.txt`
---
### Author:  [@jshenNT](https://discourse.itk.org/u/jshenNT)
#### Post date: [November 23, 2025, 5:50pm UTC](https://discourse.itk.org/t/itk-rtk-config-and-build-to-use-cudabackprojectionimagefilter-python-wrapper/7658/9 "2025-11-23T17:50:47Z")
I’ve tried multiple times, including testing on another computer in case my main environment had become corrupted over time. Unfortunately, I continue to encounter the same errors—or different ones when I make adjustments—without any success. It has been quite frustrating.
We definitely want to use your ITK/RTK framework for our reconstruction work, and I will continue to try but I really need some guidance to help get past this issue.
---
### Author:  [@simon.rit](https://discourse.itk.org/u/simon.rit)
#### Post date: [December 4, 2025, 4:49pm UTC](https://discourse.itk.org/t/itk-rtk-config-and-build-to-use-cudabackprojectionimagefilter-python-wrapper/7658/10 "2025-12-04T16:49:00Z")
I understand the frustration but I cannot reproduce your problem. If I put the following code in a `.bat` file and execute it from the regular Windows terminal (`cmd`), everything works well (except the `write_geometry` function in the example, most likely because I did not install). Maybe you can provide your `CMakeCache.txt` to understand your issue? I could compare it to this compilation.
```auto
call "C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Auxiliary\Build\vcvars64.bat"
cmake ../src/itk/ITK-main -G "Visual Studio 17 2022" -A x64 ^
-DCMAKE_BUILD_TYPE=Release ^
-DCMAKE_INSTALL_PREFIX="C:/james-install" ^
-DBUILD_EXAMPLES=OFF ^
-DBUILD_TESTING=OFF ^
-DBUILD_SHARED_LIBS=OFF ^
-DITK_WRAP_PYTHON=ON ^
-DITK_BUILD_DEFAULT_MODULES=OFF ^
-DModule_ITKCommon=ON ^
-DModule_ITKIOImageBase=ON ^
-DModule_ITKIONIFTI=ON ^
-DModule_ITKIOPNG=ON ^
-DModule_ITKIOGDCM=ON ^
-DModule_RTK=ON ^
-DModule_CudaCommon=ON ^
-DModule_CudaCommon_GIT_TAG="fdca68f53d2c9b4c34c5bacfd83d99cd9e2285a0" ^
-DRTK_USE_CUDA=ON ^
-DModule_RTK_GIT_TAG="c4722ef208891032d72860f0dd036b7c38dbb606" ^
-DITK_WRAP_unsigned_short:BOOL=ON ^
-DITK_WRAP_double:BOOL=ON ^
-DITK_WRAP_complex_double:BOOL=ON ^
-DITK_WRAP_IMAGE_DIMS:STRING="2;3;4" ^
-DPython3_EXECUTABLE="C:/Python311-x64/python.exe" ^
-DPython3_INCLUDE_DIR="C:/Python311-x64/include" ^
-DPython3_LIBRARY="C:/Python311-x64/libs/python311.lib" ^
-DPY_SITE_PACKAGES_PATH="C:/Python311-x64/Lib/site-packages" ^
-DModule_ITKHDF5:BOOL=OFF ^
-DModule_ITKIOHDF5:BOOL=OFF ^
-DModule_ITKIOTransformHDF5:BOOL=OFF ^
-DModule_ITKIOTransformBase:BOOL=OFF ^
-DModule_ITKIOTransformMatlab:BOOL=OFF
devenv ITK.sln /Build "Release|x64"
copy Wrapping\Generators\Python\WrapITK.pth test\Lib\site-packages
C:\Python311-x64\python.exe -m venv test
test\Scripts\activate.bat
pip install numpy
python c:\src\itk\ITK-main\Modules\Remote\RTK\examples\FirstReconstruction\FirstCudaReconstruction.py a.mha a.xml
```