opam's ocp-indent no longer builds with OCaml 4.02.3

[JasonGross]

#=== ERROR while compiling ocp-indent.1.5.3 ===================================#
# context              2.0.7 | linux/x86_64 | ocaml-base-compiler.4.02.3 | git+https://github.com/ocaml/opam-repository.git
# path                 ~/.opam/4.02.3/.opam-switch/build/ocp-indent.1.5.3
# command              ~/.opam/opam-init/hooks/sandbox.sh build make
# exit-code            2
# env-file             ~/.opam/log/ocp-indent-15174-ef0aa7.env
# output-file          ~/.opam/log/ocp-indent-15174-ef0aa7.out
### output ###
# Error: This expression has type
# [...]
#          | `Pre of string
#          | `S of string ]
#        is not compatible with type
#          Cmdliner.Manpage.block =
#            [ `I of string * string | `Noblank | `P of string | `S of string ] 
#        The second variant type does not allow tag(s) `Pre
# 
# Error:
# rule 108: target ./_obuild/ocp-indent/indentArgs.cmo not built
# Makefile:23: recipe for target '_obuild/ocp-indent/ocp-indent.asm' failed
# make: *** [_obuild/ocp-indent/ocp-indent.asm] Error 2

https://github.com/JasonGross/personal-website/runs/1755490996