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Configure works fine on my Fedora Core 6:
checking for g++... g++
checking whether we are using the GNU C++ compiler... yes
checking whether g++ accepts -g... yes
checking dependency style of g++... none
checking how to run the C++ preprocessor... g++ -E

Maybe the submitter didn't have g++ support installed, since his configure reports (lib/cpp) for C++ preprocessor?

This is from my machine:
[root@host]# type g++
g++ is /usr/bin/g++
[root@host]# rpm -qf /usr/bin/g++

So the package gcc-c++ needs to be installed.