message: fix cmake error on macOS
  gmp
  openssl
diff: @@ -116,7 +116,7 @@ Install the dependencies:
  ```commandline
  brew update
  -brew install git automake libtool boost openssl llvm
  +brew install git automake libtool boost openssl llvm gmp
  ```
  Install [secp256k1-zkp (Cryptonomex branch)](https://github.com/cryptonomex/secp256k1-zkp.git):
  @@ -193,7 +193,7 @@ This is needed to compile the example contracts inside eos/contracts folder and
  cd ~
  git clone https://github.com/eosio/eos --recursive
  mkdir -p ~/eos/build && cd ~/eos/build
  -cmake -DBINARYEN_BIN=~/binaryen/bin ..
  +cmake -DBINARYEN_BIN=~/binaryen/bin -DOPENSSL_ROOT_DIR=/usr/local/opt/openssl -DOPENSSL_LIBRARIES=/usr/local/opt/openssl/lib ..
  make -j4
  ```
  