Use with ocp-indent >= 1.2.0.
Just add this directory to your runtime path.
set rtp+=</path/to/ocp-indent-vim>
BEWARE: By default, ocp-indent only works with spaces, not tabs. So be sure to :set expandtab either globally or for your ocaml files, for example by putting a line au FileType ocaml setlocal expandtab in your .vimrc
Released under MIT License.
You can set the variables g:ocp_indent_args (global settings) or b:ocp_indent_args (buffer local settings) to pass arguments to ocp-indent.
Set variable to a string or a list of strings.
This may work for enabling tab-based indenting if required -- see the ocp-indent documentation.