How can I have C++ 4.2 and C++ 5.8 installed on the same box?

I am involved in porting C++4.2 code to C++ 5.6 and I would like to know if I could have both compilers sitting side by side on the same machine.
While using one compiler against the other, do I have to set any environment variables to tell the compiler which set of include files it needs to use? Or are these configured during installation? (I have used the compiler for a long time but I have never thought about how the installation works)

You should not a problem with this as long as you install each version on different uniqe directory. But please make sure the OS platform is supported by both versions. There are an issue with multiple releases on the same system with Solaris 10, but I don't think you use Solaris 10 because C++ 4.2 is not supported on Solaris 10.
Yes, you need to set environment variables to tell the compiler which set of include files, binaris or libraries it needs to use. It is not configured during installation.
-Ngoc

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