I downloaded the source code of cpp-ethereum.
then "mkdir build", "cd build"
but I got the error message below when I run "cmake .."
$ cmake ..
CMake Error at CMakeLists.txt:9 (include):
include could not find load file:
CMake Error at CMakeLists.txt:10 (eth_policy):
Unknown CMake command "eth_policy".
-- Configuring incomplete, errors occurred!
Anyone can give me a help?