elseif
Starts the elseif portion of an if block.
elseif(expression)
See the if() command.
    © 2000–2019 Kitware, Inc. and Contributors
Licensed under the BSD 3-clause License.
    https://cmake.org/cmake/help/v3.5/command/elseif.html
  
Starts the elseif portion of an if block.
elseif(expression)
See the if() command.
    © 2000–2019 Kitware, Inc. and Contributors
Licensed under the BSD 3-clause License.
    https://cmake.org/cmake/help/v3.5/command/elseif.html