Downloading Files Multiplatform

I'm trying to find the best way to simply download a single or multiple files from individual URLs as part of a GUI web installer. I've looked around and I came across cURL, but I'm having a real tough time trying to get it to link statically so I don't have to worry about a bunch of DLL files coming with a simple installer.

As part of this I would also need a way to checkout using subversion like one would do on Linux with "svn co URL." As I've said I'm trying to avoid bundling an installer with a bunch of DLL files. Does anybody have a recommendation as to which libraries to use?

On a not so related note, should I use Qt or GTK?
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