Authentication can't be enabled because it was not selected during build

[naviabbot]

Contents of meson_options.txt

option('screencopy-dmabuf', type: 'feature', value: 'disabled',
            description: 'Enable GPU-side screencopy (experimental)')
 option('pam', type: 'feature', value: 'enabled',
             description: 'Enable PAM authentication')
option('man-pages', type: 'feature', value: 'auto',
            description: 'Generate and install man pages')
option('systemtap', type: 'boolean', value: false,
            description: 'Enable tracing using sdt')

Not sure if this was the right way.

[any1]

You don't need PAM for authentication. It's just an extra feature, which is currently undocumented.

On configuring meson: https://mesonbuild.com/Build-options.html#using-build-options