Custom jQ Mobile 1.4.3 build gives "$.mobile.textinput is undefined" error during config

In my current jQM project, I'm making changes to $.mobile.textinput.initSelector on mobileinit -- an approach which works fine with the default full build of the framework. With a custom build that includes the textinput widget, I get the error "$.mobile.textinput is undefined".

Here are my checked selections for the custom build:

Animation Complete
jqmData
Defaults
Helpers
Init
Namespace
Support Tests
Orientation support test
Touch support test
Virtual Mouse (vmouse) Bindings
Widget Factory
Page Creation
Navigate
Orientation Change
Throttled Resize
Touch
Events
Buttons: Link-based
Fieldcontainers
Controlgroups
Textarea Autosize
Buttons: Input or button-based
Checkboxes & Radio Buttons
Text Input Clear Button
Form Reset
Selects
Slider
Slidertooltip
Text Inputs & Textareas
Content Management
Base Tag
History Manager
Navigate Method
Navigation Manager
Path Helpers
Content Management
Transition Concurrent
Transition Handlers
Transition Serial
Transition Core
Pop Transition
Degrade Inputs
Link Classes
Match Media Polyfill
“nojs” Classes
Zoom Handling
iOS Orientation Change Fix
First & Last Classes
Collapsible
Collapsible Sets (Accordions)
Toolbars: Fixed
Toolbars: Fixed: Workarounds
Listview
Loading Message
Dialog styling
Panel
Popups
popuparrow
Toolbars: Fixed