option('static_link', type: 'boolean', value: false, description: 'statically link the binary')
option('build_timestamp', type: 'string', value: '', description: 'build timestamp (defaults to current time if empty)')
option('tls_library', type: 'combo', choices: ['openssl', 'mbedtls'], value: 'openssl', description: 'TLS library to use')