mccd gsettings set org.gnome.desktop.interface cursor-theme Adwaita
and it says in .xsession-errors: "No schemas installed".
I get a different, but understandable, message:
$ gsettings get org.gnome.desktop.interface cursor-theme
No such schema “org.gnome.desktop.interface”
$
Understandable because I'm not running Gnome and no other program has created that schema. All I have is:
$ gsettings list-recursively
org.gtk.Demo color 'red'
org.gtk.Demo fullscreen false
org.gtk.Demo maximized false
org.gtk.Demo window-size (-1, -1)
org.gtk.Settings.ColorChooser custom-colors @a(dddd) []
org.gtk.Settings.ColorChooser selected-color (false, 1.0, 1.0, 1.0, 1.0)
org.gtk.Settings.Debug enable-inspector-keybinding false
org.gtk.Settings.Debug inspector-warning true
org.gtk.Settings.EmojiChooser recent-emoji @a((auss)u) []
org.gtk.Settings.FileChooser clock-format '24h'
org.gtk.Settings.FileChooser date-format 'regular'
org.gtk.Settings.FileChooser expand-folders false
org.gtk.Settings.FileChooser last-folder-uri ''
org.gtk.Settings.FileChooser location-mode 'path-bar'
org.gtk.Settings.FileChooser show-hidden false
org.gtk.Settings.FileChooser show-size-column true
org.gtk.Settings.FileChooser show-type-column true
org.gtk.Settings.FileChooser sidebar-width 177
org.gtk.Settings.FileChooser sort-column 'name'
org.gtk.Settings.FileChooser sort-directories-first false
org.gtk.Settings.FileChooser sort-order 'ascending'
org.gtk.Settings.FileChooser startup-mode 'recent'
org.gtk.Settings.FileChooser type-format 'category'
org.gtk.Settings.FileChooser window-position (218, 324)
org.gtk.Settings.FileChooser window-size (1201, 728)
org.gtk.exampleapp font 'Monospace 12'
org.gtk.exampleapp show-words false
org.gtk.exampleapp transition 'none'
$
These're created in /usr/pkg/share/glib-2.0/schemas/*.xml
and have values set (by programs) in ~/.config/glib-2.0/settings
(eg. keyfile
there).