This is a CMake Environment Variable. Its initial value is taken from the calling process environment.
Initializes the CTEST_USE_LAUNCHERS variable if not already defined.
© 2000–2019 Kitware, Inc. and Contributors
Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.15/envvar/CTEST_USE_LAUNCHERS_DEFAULT.html