[itk] Use fftw3 threads and config

ports/itk/fftw.diff

@@ -0,0 +1,46 @@
+diff --git a/CMake/FindFFTW.cmake b/CMake/FindFFTW.cmake
+index 709c0cd..1f08467 100644
+--- a/CMake/FindFFTW.cmake
++++ b/CMake/FindFFTW.cmake
+@@ -30,7 +30,17 @@
+ ## to set the initial value of the CMake variable `MKLROOT` (see
+ ## https://software.intel.com/en-us/mkl-linux-developer-guide-scripts-to-set-environment-variables).
+
+-if(ITK_USE_FFTWD OR ITK_USE_FFTWF)
++if((ITK_USE_FFTWD OR ITK_USE_FFTWF) AND NOT ITK_USE_CUFFTW)
++  find_path(FFTW_INCLUDE_PATH fftw3.h)
++  if(ITK_USE_FFTWD)
++    find_package(FFTWD NAMES FFTW3 CONFIG)
++    set(FFTWD_LIBRARIES FFTW3::fftw3)
++  endif()
++  if(ITK_USE_FFTWF)
++    find_package(FFTWF NAMES FFTW3f CONFIG)
++    set(FFTWF_LIBRARIES FFTW3::fftw3f)
++  endif()
++elseif(ITK_USE_FFTWD OR ITK_USE_FFTWF)
+
+   if(ITK_USE_MKL)
+     # If the user has provided the MKL include path then search nearby for library files
+diff --git a/CMake/ITKConfig.cmake.in b/CMake/ITKConfig.cmake.in
+index 7a77ae3..c4ffd3a 100644
+--- a/CMake/ITKConfig.cmake.in
++++ b/CMake/ITKConfig.cmake.in
+@@ -1,3 +1,10 @@
++include(CMakeFindDependencyMacro)
++if("@ITK_USE_FFTWD@")
++  find_dependency(FFTW3::fftw3 CONFIG)
++endif()
++if("@ITK_USE_FFTWF@")
++  find_dependency(FFTW3::fftw3f CONFIG)
++endif()
+ #-----------------------------------------------------------------------------
+ #
+ # ITKConfig.cmake - ITK CMake configuration file for external projects.
+@@ -108,7 +115,6 @@ set(ITK_FFTW_LIBDIR "@FFTW_LIBDIR@")
+ # Add FFTW include and library directories
+ if (ITK_USE_FFTWF OR ITK_USE_FFTWD)
+   set(ITK_INCLUDE_DIRS ${ITK_INCLUDE_DIRS} "${ITK_FFTW_INCLUDE_PATH}")
+-  set(ITK_LIBRARY_DIRS ${ITK_LIBRARY_DIRS} "${ITK_FFTW_LIBDIR}")
+ endif()
+
+ # Add configuration with GPU

ports/itk/portfile.cmake

@@ -17,6 +17,7 @@ vcpkg_from_github(
     HEAD_REF master
     PATCHES
         double-conversion.patch
+        fftw.diff
         openjpeg.patch
         openjpeg2.patch
         var_libraries.patch

ports/itk/vcpkg.json

@@ -61,7 +61,12 @@
     "fftw": {
       "description": "Enable the FFTW backend",
       "dependencies": [
-        "fftw3"
+        {
+          "name": "fftw3",
+          "features": [
+            "threads"
+          ]
+        }
       ]
     },
     "opencl": {

versions/i-/itk.json

@@ -1,7 +1,7 @@
 {
   "versions": [
     {
-      "git-tree": "cec6511954f40c271d710fc064fc41a2946a8173",
+      "git-tree": "f94333fcdb47b821facfa048d17594fbc228767b",
       "version": "5.4.0",
       "port-version": 1
     },