option('manpage', type: 'boolean', value: true, description: 'Build man pages')
option('gcrypt', type: 'boolean', value: true, description: 'With gcrypt and transport encryption')
option('debugging', type: 'boolean', value: false, description: 'Turn debugging on/off')
option('vapi', type: 'boolean', value: true, description: 'Create VAPI file.')
option('gtk_doc', type: 'boolean', value: true, description: 'Build reference documentation using gtk-doc')