How to install Klassy Window Decoration?

This is the github for it.
I tried installing it but it gave me the following errors.

CMake Error at /usr/lib64/cmake/Qt6Qml/Qt6QmlFindQmlscInternal.cmake:33 (find_package):
  find_package called with invalid argument "6.2.breeze6.2.1"
Call Stack (most recent call first):
  /usr/lib64/cmake/Qt6Qml/Qt6QmlConfig.cmake:153 (include)
  /usr/share/cmake/Modules/CMakeFindDependencyMacro.cmake:76 (find_package)
  /usr/lib64/cmake/KF6Config/KF6ConfigConfig.cmake:53 (find_dependency)
  /usr/share/cmake/Modules/CMakeFindDependencyMacro.cmake:76 (find_package)
  /usr/lib64/cmake/KF6ColorScheme/KF6ColorSchemeConfig.cmake:41 (find_dependency)
  /usr/share/cmake/Modules/CMakeFindDependencyMacro.cmake:76 (find_package)
  /usr/lib64/cmake/KF6FrameworkIntegration/KF6FrameworkIntegrationConfig.cmake:38 (find_dependency)
  CMakeLists.txt:119 (find_package)
  CMakeLists.txt:199 (build_Qt6)

and

CMake Warning (dev) at /usr/share/ECM/kde-modules/KDEClangFormat.cmake:109 (add_custom_command):
  Exactly one of PRE_BUILD, PRE_LINK, or POST_BUILD must be given.  Assuming
  POST_BUILD to preserve backward compatibility.

  Policy CMP0175 is not set: add_custom_command() rejects invalid arguments.
  Run "cmake --help-policy CMP0175" for policy details.  Use the cmake_policy
  command to set the policy and suppress this warning.
Call Stack (most recent call first):
  CMakeLists.txt:207 (kde_clang_format)
This warning is for project developers.  Use -Wno-dev to suppress it.

CMake Warning at /usr/share/ECM/kde-modules/KDEGitCommitHooks.cmake:155 (message):
  No clang-format executable was found, skipping the formatting pre-commit
  hook
Call Stack (most recent call first):
  CMakeLists.txt:208 (kde_configure_git_pre_commit_hook)

This part confuses me the most

-- Configuring incomplete, errors occurred!
make: *** No targets specified and no makefile found.  Stop.
make: *** No rule to make target 'install'.  Stop.
zack@localhost:~/klassy> ./install
bash: ./install: No such file or directory

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