CMAKE_INSTALL_DEFAULT_COMPONENT_NAME

Default component used in :command:install commands.

If an :command:install command is used without the COMPONENT argument, these files will be grouped into a default component. The name of this default install component will be taken from this variable. It defaults to Unspecified.

There is a special component name:

<PROJECT_NAME> .. versionadded:: 4.4

This literal placeholder will expand to the contents of the :variable:PROJECT_NAME variable when the :command:install command is evaluated. If no :command:project command has been called it defaults to Unspecified.