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# Installing AltosUI on Mac OS X
Mac OS X places barriers to running software from outside of the Apple
ecosystem on Apple hardware. Whenever you download softwarae, the
browser tags the application as 'foreign' and that prevents the
operating system from running it.
Here's how you can use xattr(1) to clear the protection setting from
the AltosUI.app after it is installed.
1. Display the application extended attributes:
$ xattr -l /Applications/AltosUI.app
com.apple.quarantine:
0181;5a380dfb;Google\x20Chrome.app;6B17C3F9-68D3-4C27-A5EA-7ADADE376ACD
This shows that the app was downloaded using google chrome. Other
users' values will be different but the com.apple.quarantine
prefix will be the same!). If this attribute is present
AltosUI.app won't be allowed to run.
1. Use the following command to remove the attribute preventing MacOS
X from running this application:
$ sudo xattr -c /Applications/AltosUI.app
This clears the extended attribute in question. You should now be
able to run our app!
1. Check to make sure the attribute has been cleared:
$ xattr -l /Applications/AltosUI.app
NOTE: this has to be run every time one installs a new version!
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