message: install fmt for osx build
  Summary: ^
diff: @@ -128,7 +128,8 @@ function install_dependencies_mac() {
  snappy \
  xz \
  openssl \
  - libsodium
  + libsodium \
  + fmt
  brew link \
  boost \
  @@ -139,7 +140,8 @@ function install_dependencies_mac() {
  lz4 \
  snappy \
  xz \
  - libsodium
  + libsodium \
  + fmt
  }
  function setup_folly() {
  