Question about supported databases

[Samuel Figueroa]

I am wondering if gnucash only works with open source databases, or does 
it also work with, for example, proprietary, but free, databases, such 
as Oracle or IBM DB2?  If the answer is yes, would I need to recompile 
the gnucash source code, or is the support built into the binaries 
available for download?  I primarily use Windows 7, but I can run other 
OS's in a virtual machine, for example, if the OS makes a difference.