As can be seen from the Windows tinderboxes, and I also see it on my own machine, the build breaks in cli_ure. climaker.exe, a managed C++ program, gets an exception: <div style="margin-left:40px;font-family:courier new,monospace"> A first chance exception of type 'System.BadImageFormatException' occurred in mscorlib.dll Additional information: Could not load file or assembly 'cli_basetypes' or one of its dependencies. This assembly is built by a runtime newer than the currently loaded runtime and cannot be loaded. </div> I think this is because the managed C++ code in climaker.exe has been compiled by cl.exe from VS2008, but the cli_basetypes.dll (and other C# code in LO) has been compiled with the C# compiler from the .NET Framework 4.0. This is because of change 6b0b50e0ec05a6a5279597a3c1158190969e2de0 to oowintool which makes it prefer the 4.0 csc.exe. Before the change, it used to prefer the 3.5 one. I think this needs to be changed to depend on which MSVC is found... if it is 2010, then only the 4.0 C# compiler can be used, and if it is 2008, then the 3.5 or 2.0 C# compiler can be used. That helps at least for me... --tml