The command line for the cmake is missing a part, the full line is:
cmake -G "Visual Studio 12 Win64" ..
The two .. at the end tell cmake to use the webthree-umbrella directory's cmakelists.txt file.
cmake should create the ethereum.sln for you.
I was finally able to get this to work.
1. git clone https://github.com/ethereum/webthree-umbrella
2. run getstuff.bat in webthree-umbrella\webthree-helpers\extdep directory
3. create webthree-umbrella\build
4. run "cmake .." from webthree-umbrella…
I am on Win 10 64Bit.
I have followed the instruction on the WIKI and I also get the error:
CMake Error at CMakeLists.txt:10 (eth_policy):
Unknown CMake command "eth_policy".
I see THREE different software repositories, one the cpp-ethereum-cmake …