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I've installed g++-4.5 via apt, and there exists a /usr/bin/g++-4.5. However, when I try and run g++-4.5, I get this error message:

/usr/bin/g++-4.5: not found (hardened-c++ could not find target)

In fact, the file /usr/bin/g++-4.5 seems to be a perl script. I understand that Ubuntu uses hardening wrappers around gcc, but I don't know how to actually compile something using g++ in this state.

How can I fix this?

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This is just a poor error message, which indicates that g++-4.5 is not installed. I needed to install g++-4.5 Install g++-4.5 (which I thought I had, but I must have installed gcc-4.5 instead).

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