Trackpad has been moved into its own prefpane on all Apple notebooks. It requires a device with certain id to be present in order to show up.
If you want to get the new trackpad prefpane, remove /System/Library/PreferencePanes/Trackpad.prefpane and put this into /Library/PreferencePanes.
Trackpad.prefPane.zip ( 210.13K ) Number of downloads: 204
(removed the useless gesture videos, so it takes less space)
Basically what you need to remove is NSPrefPaneIOServiceAttributesToMatch and NSPrefPaneIOServiceToMatch keys in Info.plist.
As Chrysaor explain in the post, we just need to remove this two entry, NSPrefPaneIOServiceAttributesToMatch and NSPrefPaneIOServiceToMatch, in the Info.plist file inside Trackpad.prefPane folder:-
To edit that file, you need to use an application called "PlistEdit Pro". If you don't want to do it yourself, you can download Trackpad.prefPane file which already fixed from above post.
But there is a trick to fix this problem where even if we do it right, there is a chance that trackpad preference may not visible in System Preferences. In the process to fix this problem, I found out only this step can make sure that I finally get my trackpad preference back. Download the file included in Chrysaor's post & save it at Desktop. Unzip the file to get the content. Follow this procedure (all done using Terminal):-
After that, reboot immediately & you should be able to get trackpad preference in System Preferences.
1) Open terminal & enter this command:
sudo -s2) Create backup directory:
mkdir /BackupPreferencePanes3) Backup original Trackpad.prefPane file to the backup folder:
cp -R /System/Library/PreferencePanes/Trackpad.prefPane /BackupPreferencePanes4) Remove original Trackpad.prefPane file:
rm -rf /System/Library/PreferencePanes/Trackpad.prefPane5) Copy Trackpad.prefPane file that you downloaded earlier to original location:
cp -R ~/Desktop/Trackpad.prefPane /System/Library/PreferencePanes/6) Exit terminal:
EDIT: On 10.5.6, the trackpad preference has been moved into its own preference pane. It will located on the main window of System Preferences.
EDIT: If you don't want to do it manually, please download this installer:Trackpad.prefPane_Fix.10.5.6.pkg