cpp-ethereum build error

Question

I have cloned the cpp-ethereum in Linux (centOS) from git as follows as suggested in cpp-ethereum-develop cmake error

git clone https://github.com/ethereum/cpp-ethereum 

cd cpp-ethereum

git checkout -b develop

git submodule update --init --recursive

mkdir -p build
cd build
cmake .. 

When I run the cmake command

    -- The C compiler identification is GNU 4.8.5
    -- The CXX compiler identification is GNU 4.8.5
    -- Check for working C compiler: /usr/bin/cc
    -- Check for working C compiler: /usr/bin/cc -- works
    -- Detecting C compiler ABI info
    -- Detecting C compiler ABI info - done
    -- Check for working CXX compiler: /usr/bin/c++
    -- Check for working CXX compiler: /usr/bin/c++ -- works
    -- Detecting CXX compiler ABI info
    -- Detecting CXX compiler ABI info - done
    CMake Error at /usr/local/share/cmake-3.0/Modules/ExternalProject.cmake:1402 (message):

  URL_HASH is set to

    SHA256=087640ebcf7fbcfe8e2717a0b9528fff89c52fcf69fa2a18cc2b538008098f97;DOWNLOAD_NO_PROGRESS;True

  but must be ALGO=value where ALGO is

    MD5|SHA1|SHA224|SHA256|SHA384|SHA512

  and value is a hex string.
Call Stack (most recent call first):
  /usr/local/share/cmake-3.0/Modules/ExternalProject.cmake:1846 (_ep_add_download_command)
  cmake/jsoncpp.cmake:3 (ExternalProject_Add)
  CMakeLists.txt:45 (include)


-- Configuring incomplete, errors occurred!
See also "/home/user/cpp-ethereum/build/CMakeFiles/CMakeOutput.log".

How to solve this problem? Even the log file does not have the proper details about the error.

Answer 1

It looks like the build process was broken with this commit. They'll likely fix it soon, but for now you can do

cd cpp-ethereum
git checkout 5669c209f4f8dbb7dc3f744e8e2a9c92f1104ca3

and then go ahead with the rest of the build process

You can also open an issue here to bring this to the developer's attention. Please include detailed specs for your machine (OS version, any error logs, etc.)