How to check for dependencies before creating an RPM package?

As the title suggests, how do I check without having to compile the package myself? In my case, I am going to build a package from somewhere else.

EDIT: Sorry for being unclear. What I mean by "build a package from somewhere else" is that I have to create a RPM package from source code, not by installing it. Without having to run ./configure, is there other way to check? In the RPM spec file, I have to put in BuildRequire, but how do it know? In SFML source for example, it doesn't have a configure file.

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