Description of problem:

InsightToolkit-devel depends on gdcm-devel, libminc-devel, and vxl-devel but those requirements are not in the package spec file.

Version-Release number of selected component (if applicable):
% rpm -q InsightToolkit-devel                                                                                  
InsightToolkit-devel-4.13.3-7.fc35.x86_64

How reproducible: always


Steps to Reproduce:
1. dnf install cmake InsightToolkit-examples
2. mkdir /tmp/build
3. ITK_DIR=/usr/lib64/cmake/InsightToolkit  cmake -B /tmp/build -S /usr/share/InsightToolkit/examples/Installation

Actual results:

% ITK_DIR=/usr/lib64/cmake/InsightToolkit cmake -B /tmp/build -S /usr/share/InsightToolkit/examples/Installation 
CMake Error at /usr/lib64/cmake/InsightToolkit/Modules/ITKGDCM.cmake:15 (find_package):
  By not providing "FindGDCM.cmake" in CMAKE_MODULE_PATH this project has
  asked CMake to find a package configuration file provided by "GDCM", but
  CMake did not find one.

  Could not find a package configuration file provided by "GDCM" with any of
  the following names:

    GDCMConfig.cmake
    gdcm-config.cmake


Expected results:
No CMake error

Additional info:
After `dnf install gdcm-devel`:

~/tmp/build% ITK_DIR=/usr/lib64/cmake/InsightToolkit cmake -B /tmp/build -S /usr/share/InsightToolkit/examples/Installation
CMake Error at /usr/lib64/cmake/InsightToolkit/Modules/ITKMINC.cmake:15 (find_package):
  By not providing "FindLIBMINC.cmake" in CMAKE_MODULE_PATH this project has
  asked CMake to find a package configuration file provided by "LIBMINC", but
  CMake did not find one.

  Could not find a package configuration file provided by "LIBMINC" with any
  of the following names:

    LIBMINCConfig.cmake
    libminc-config.cmake

Then, after `dnf install libminc-devel`, the CMake run is fine, but:

% cmake --build /tmp/build
[ 50%] Building CXX object CMakeFiles/HelloWorld.dir/HelloWorld.cxx.o
In file included from /usr/include/InsightToolkit/itkConceptChecking.h:32,
                 from /usr/include/InsightToolkit/itkAtomicIntDetail.h:39,
                 from /usr/include/InsightToolkit/itkAtomicInt.h:38,
                 from /usr/include/InsightToolkit/itkTimeStamp.h:33,
                 from /usr/include/InsightToolkit/itkLightObject.h:23,
                 from /usr/include/InsightToolkit/itkObject.h:31,
                 from /usr/include/InsightToolkit/itkRegion.h:31,
                 from /usr/include/InsightToolkit/itkImageRegion.h:31,
                 from /usr/include/InsightToolkit/itkImage.h:21,
                 from /usr/share/InsightToolkit/examples/Installation/HelloWorld.cxx:27:
/usr/include/InsightToolkit/itkNumericTraits.h:51:11: fatal error: vcl_limits.h: No such file or directory
   51 | # include "vcl_limits.h"
      |           ^~~~~~~~~~~~~~


After `dnf install vxl-devel`, there is a link error:

% cmake --build /tmp/build   
[ 50%] Building CXX object CMakeFiles/HelloWorld.dir/HelloWorld.cxx.o
In file included from /usr/include/InsightToolkit/itkNumericTraits.h:51,
                 from /usr/include/InsightToolkit/itkConceptChecking.h:32,
                 from /usr/include/InsightToolkit/itkAtomicIntDetail.h:39,
                 from /usr/include/InsightToolkit/itkAtomicInt.h:38,
                 from /usr/include/InsightToolkit/itkTimeStamp.h:33,
                 from /usr/include/InsightToolkit/itkLightObject.h:23,
                 from /usr/include/InsightToolkit/itkObject.h:31,
                 from /usr/include/InsightToolkit/itkRegion.h:31,
                 from /usr/include/InsightToolkit/itkImageRegion.h:31,
                 from /usr/include/InsightToolkit/itkImage.h:21,
                 from /usr/share/InsightToolkit/examples/Installation/HelloWorld.cxx:27:
/usr/include/vxl/vcl/vcl_limits.h:11:5: warning: #warning "This header will be removed in future versions of VXL.  Use equivalent C++11 header instead. see: vxl/scripts/UseStandardHeaders.py" [-Wcpp]
   11 |   # warning "This header will be removed in future versions of VXL.  Use equivalent C++11 header instead. see: vxl/scripts/UseStandardHeaders.py"
      |     ^~~~~~~
gmake[2]: *** No rule to make target '/usr/lib64/libfftw3.so', needed by 'HelloWorld'.  Stop.

After `dnf install fftw-devel`, there is still an issue, but this one cannot be solved easily:

    /usr/bin/ld: cannot find -lGTest::GTest
    /usr/bin/ld: cannot find -lGTest::Main

For that, we need a small modification of the `CMakeLists.txt`, to search for one ITK component, to exclude the component `ITKGoogleTest`:

    cmake_minimum_required(VERSION 3.1...3.20)
    project(HelloWorld)
    
    find_package(ITK REQUIRED COMPONENTS ITKCommon)
    include(${ITK_USE_FILE})
    
    add_executable(HelloWorld HelloWorld.cxx )
    
    target_link_libraries(HelloWorld ${ITK_LIBRARIES})

Note that `fftw-devel` is only required by the module `ITKFFT` (file /usr/lib64/cmake/InsightToolkit/ITKTargets.cmake). The other dependencies are really mandatory, even for the CMake component `ITKCommon`.