Overwrite file from svn:externals

I'm using svn:externals to include code from another project - for which I do not want to commit changes to.

One of the files included by svn:externals needs a small change (just a line) to work with my current project. So I want to commit this to my own SVN.

How do I do this? If I try and commit as things are now, it tries to commit my changes to this file to the owners SVN - which obviously 开发者_如何学编程isn't possible.

Should be easy I guess? I'm using TortoiseSVN on Windows

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Maybe you need a vendor branch. That is, copy the external to your own repo, make your changes and periodically update the copy.