My expectation is that the "Berkeley DB 4.6.21.msi Windows installer" at the oracle website would give you a windows version of the db library that you can use with Strawberry. Even if the library it provides was built using Visual Studio, MinGW will still be able to link to it - so, as long as that msi does, in fact, give you a db library for windows, you should be right (unless that library turns out to be crippled in some siginificant aspect).