Install composer.phar, then:
hhvm composer.phar install
bin/truncate-output
My output:
$ hhvm --version
HipHop VM 3.29.0-dev (rel)
Compiler: 1536737482_N
Repo schema: 8a78556751394ed6c791c3d629f38c924a4d258b
$ bin/truncate-output
...............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
Bytes: 4096
Written: 1023
$ hhvm --version
HipHop VM 3.28.1-0brew (rel)
Compiler: 1535653169_N
Repo schema: ed03fa8a65e13f65b82bea4821ae02309c6a3d11
$ bin/truncate-output
...............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
Bytes: 4096
Written: 1023