As you quite rightly said, neither of these OS versions are supported, but let's have a go anyway.
First of all, what does "file -L /usr/lib/libc.so" output? If it says something like "ASCII C program text", please paste the contents here. If it says something else, paste the output of the file command here.
My guess is that your OS only has 64 bit shared libraries installed, and not 32 bit.
Can you also try running spectre with "-64" on the command line? (this can be done in ADE via the usrCmdLineOption field in Setup->Environment; I don't; think the "64 bit" checkbox is in the version you're using).
In reply to Andrew Beckett: