I don't not understand what you mean by that. You do not need to use any SVN "export" command; just SVN "Update", possibly after "SVN Upgrade Working Copy" (if your version of the SVN client requires it).
On TortoiseSVN the commands are either import to upload your code changes to the SVN repository, or export to download the code to your PC. Not sure if I am picking the correct directory in the SDK to do the export. I am picking the top level SDK directory. I don't see an update/upgrade command in TortoiseSVN.
Getting the error how and when? What did you try to do?
When I request that MSVC 2010 do a build on the project located in the directory FreeOrion/trunk/FreeOrion/msvc2010/FreeOrion.sln; I get the error message.
The SDK contains a "Boost" directory that has all the boost headers and .lib files in it (in their respective subdirectories).
Yes, I can see the boost directory and the files, but I still get an error message on in the SDK. What I can't figure out is how to tell the MSVC project where to find the boost files. Maybe i am just too green at doing compiles in MSVC to know how to point it to them. Maybe I didn't do the SVN download (export) into the right SDK directory. I am just looking for someone who has done the complie in MSVC2010 with TortioseSVN successfully to suggest what I am doing wrong.