I am installing Eclipse on Mac OS X Mountain Lion. Unpacking the
.tar.gz was no problem, however, when I went to run it for the first
time I got the following error message:
Your security preferences allow installation of only apps from the Mac App Store and identified developers
To add Eclipse to the list of ‘approved’ applications run the following command in a terminal:
xattr -d com.apple.quarantine /path/to/Eclipse.app