```cmake
#
# ITK WikiExamples
#

# If the environment var WikiExamplesTag exists, use it
if (NOT DEFINED ENV{WikiExamplesTag})
  set(GIT_TAG ee85e99ab3cdd0dd4bedbdd7893c48a09cab0244
     )
else()
  set(GIT_TAG ee85e99ab3cdd0dd4bedbdd7893c48a09cab0244
     )
endif()

itk_fetch_module(WikiExamples
  "A collection of examples that illustrate how to use ITK."
  GIT_REPOSITORY ${git_protocol}://github.com/InsightSoftwareConsortium/ITKWikiExamples.git
  GIT_TAG ee85e99ab3cdd0dd4bedbdd7893c48a09cab0244
  )
```

Address use of CMake variables in CMakeLists.txt.
user
```cmake
#
# ITK WikiExamples
#

# If the environment var WikiExamplesTag exists, use it
if (NOT DEFINED ENV{WikiExamplesTag})
  set(GIT_TAG ee85e99ab3cdd0dd4bedbdd7893c48a09cab0244)
else()
  set(GIT_TAG $ENV{WikiExamplesTag})
endif()

itk_fetch_module(WikiExamples
  "A collection of examples that illustrate how to use ITK."
  GIT_REPOSITORY ${git_protocol}://github.com/InsightSoftwareConsortium/ITKWikiExamples.git
  GIT_TAG ${GIT_TAG}
  )
```
assistant