# ITKFFTExport.h is missing?

**URL:** https://discourse.itk.org/t/itkfftexport-h-is-missing/1966
**Category:** Beginner Questions
**Tags:** python
**Created:** [June 14, 2019, 2:07am UTC](https://discourse.itk.org/t/itkfftexport-h-is-missing/1966 "2019-06-14T02:07:05Z")
**Posts on this page:** 5
**Page:** 1

<div class="post-metadata">

### Author: ![revolvet](https://discourse.itk.org/letter_avatar_proxy/v4/letter/r/ebca7d/32.png) [@revolvet](https://discourse.itk.org/u/revolvet)
#### Post date: [June 14, 2019, 2:07am UTC](https://discourse.itk.org/t/itkfftexport-h-is-missing/1966/1 "2019-06-14T02:07:05Z")

</div>

Hi. I’m trying to build python wrapper for ITK. There is an error saying that MSVC 16.1.2 (2019) (Windows 10) can’t find ITKFFTExport.h. I search through the source folder and can’t find this header. itkFFTWGlobalConfiguration.xml originally requires it. Many projects fail because they are dependent of this xml, including ITKFFTCastXML, ITKConvolutionSwig and RTKSwig projects. Could you help solving the issue?

---

<div class="post-metadata">

### Author: ![dzenanz](https://discourse.itk.org/user_avatar/discourse.itk.org/dzenanz/32/1093_2.png) [@dzenanz](https://discourse.itk.org/u/dzenanz)
#### Post date: [June 14, 2019, 1:38pm UTC](https://discourse.itk.org/t/itkfftexport-h-is-missing/1966/2 "2019-06-14T13:38:30Z")

</div>

This file is located in `build_dir/Modules/Core/Common/ITKFFTExport.h`. Did you [enable](https://github.com/InsightSoftwareConsortium/ITK/blob/2cbb60f9bff926f28fe346cd49a7eacb87a419bd/Modules/Filtering/FFT/CMakeLists.txt#L3) FFTW, MKL or cuFFT?

---

<div class="post-metadata">

### Author: ![revolvet](https://discourse.itk.org/letter_avatar_proxy/v4/letter/r/ebca7d/32.png) [@revolvet](https://discourse.itk.org/u/revolvet)
#### Post date: [June 14, 2019, 3:06pm UTC](https://discourse.itk.org/t/itkfftexport-h-is-missing/1966/3 "2019-06-14T15:06:19Z")

</div>

There is no “ITKFFTExport.h” in that folder. I enabled ITK\_USE\_CUFFTW, which also required me to enable ITK\_USE\_FFTWD, ITK\_USE\_FFTWF and ITK\_USE\_SYSTEM\_FFTW.

---

<div class="post-metadata">

### Author: ![dzenanz](https://discourse.itk.org/user_avatar/discourse.itk.org/dzenanz/32/1093_2.png) [@dzenanz](https://discourse.itk.org/u/dzenanz)
#### Post date: [June 14, 2019, 3:23pm UTC](https://discourse.itk.org/t/itkfftexport-h-is-missing/1966/4 "2019-06-14T15:23:57Z")

</div>

@matt.mccormick have you tested cuFFT+Python wrapping scenario?

---

<div class="post-metadata">

### Author: ![revolvet](https://discourse.itk.org/letter_avatar_proxy/v4/letter/r/ebca7d/32.png) [@revolvet](https://discourse.itk.org/u/revolvet)
#### Post date: [June 14, 2019, 3:50pm UTC](https://discourse.itk.org/t/itkfftexport-h-is-missing/1966/5 "2019-06-14T15:50:54Z")

</div>

I see that file now !. I think the cause of the problem probably is that I didn’t add fftw path to Environment variables. Thank you for your help.