Error Message.
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Your compiler failed with the exit status 4. This probably means that it ran out of memory. To solve this problem, try increasing your swap space:
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$ sudo dd if=/dev/zero of=/swap bs=2M count=1024
$ sudo mkswap /swap
$ sudo swapon /swap
$ sudo mkswap /swap
$ sudo swapon /swap
$ sudo passenger-install-apache2-module
