option('backends', type: 'array', choices: ['gtk3', 'gtk4', 'qt5'], value: ['gtk3', 'gtk4', 'qt5'],
  description : 'A list of portal backends to build')
option('portal-tests', type: 'boolean', value: false,
  description : 'Build portal tests of each backend')
option('introspection', type: 'boolean', value: true,
  description: 'Generate GObject introspection files')
option('vapi', type: 'boolean', value: true,
  description : 'Generate Vala bindings')
option('docs', type: 'boolean', value: true,
  description : 'Build API reference with gi-docgen')
option('tests', type: 'boolean', value: true,
  description : 'Build unit tests')
