Until issue 704 is resolved, Passenger Standalone won’t compile properly on Ubuntu 11.10 (Oneirc Ocelot - currently pre-release) using the default settings.

To work around this, use GCC 4.4 instead. You’ll need to install gcc-4.4 and libstdc++6-4.4-dev and then specify GCC 4.4 at compile time using the CC environment variable.

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$ sudo apt-get install gcc-4.4 libstdc++6-4.4-dev
$ CC=gcc-4.4 passenger start

Hopefully this will help anyone else who’s updated to the latest Ubuntu pre-release and still wants to use Passenger Standalone.