xsrc/53040: unable to utilise XkbModel macbook78 or macbook79 in xorg.conf

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>Number:         53040
>Category:       xsrc
>Synopsis:       unable to utilise XkbModel macbook78 or macbook79 in xorg.conf
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    xsrc-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Feb 19 22:00:00 +0000 2018
>Originator:     Sevan Janiyan
>Release:        NetBSD-HEAD
>Organization:
>Environment:
NetBSD 8.99.12 amd64 x86_64
>Description:
Attempting to use  Option "XkbModel" "macbook79" or 78 results in an error loading the keymap.
 
[  1972.301] (II) Using input driver 'kbd' for 'Keyboard0'
[  1972.301] (**) Option "CoreKeyboard" "on"
[  1972.301] (**) Keyboard0: always reports core events
[  1972.301] (**) Keyboard0: always reports core events
[  1972.301] (**) Option "Protocol" "standard"
[  1972.301] (**) Option "XkbRules" "xorg"
[  1972.301] (**) Option "XkbModel" "macbook79"
[  1972.301] (**) Option "XkbLayout" "us"
[  1972.301] (**) Option "XkbVariant" "dvorak"
[  1972.301] (**) Option "XkbOptions" "ctrl:nocaps"
[  1972.302] (II) XINPUT: Adding extended input device "Keyboard0" (type: KEYBOARD, id 7)
[  1972.321] (EE) Error loading keymap /tmp/server-0.xkm
[  1972.321] (EE) XKB: Failed to load keymap. Loading default keymap instead.
>How-To-Repeat:

Set the following in /etc/xorg.conf & startx

Section "InputDevice"
	Identifier  "Keyboard0"
	Driver      "kbd"
	Option      "XkbRules" "xorg"
	Option      "XkbModel" "macbook79"
	Option      "XkbLayout" "us"
        Option      "XkbVariant""dvorak"
	Option      "XkbOptions""ctrl:nocaps"
EndSection
>Fix: