GdkPixbuf 2.42.0 introduced new build-time options to increase consistency with the rest of the GNOME core platform:
docsoption has been deprecated; it’s now recommended to use the
gtk_docoption to build the API reference for GdkPixbuf, and the
manoption to build the manual pages for the various tools
giroption has been renamed to
introspection, and it uses a “feature” type instead of a boolean one
In both cases, the change was made to match what other GNOME libraries already do.