well, I was on the same trail and the problem seem to be the svn --version command which return error even when executed from cmd
look
C:\Prg\Lazarus\TrunkAll\fpcbootstrap\svn\svn-win32-1.8.13\bin\svn.exe --version
svn: E200029: Couldn't perform atomic initialization
svn: E170001: Could not initialized the SASL library: generic failure
BTW, the last executable didn't solve the problem.