ocaml-manual 5.1.0

Error log

The package failed to build. The error log from opam follows.

Opam plugin "depext" may require upgrading/reinstalling. Reinstall the plugin on the current switch? [Y/n] y
The following actions will be performed:
  - recompile opam-depext 1.2.3

<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><><><>
-> retrieved opam-depext.1.2.3  (cached)
-> removed   opam-depext.1.2.3
-> installed opam-depext.1.2.3
Done.

<><> opam-depext.1.2.3 installed successfully <><><><><><><><><><><><><><><><><>
=> opam-depext is unnecessary when used with opam >= 2.1. Please use opam install directly instead
# Run eval $(opam env) to update the current shell environment

<><> Carrying on to "opam depext -viy ocaml-manual.5.1.0" <><><><><><><><><><><>

Since version 2.1, opam now handles external dependencies alongside OCaml ones, and the `depext` plugin interface is provided for backwards compatibility only. Consider using your usual `opam install` command to install both OCaml and system dependencies, or `opam install <pkg> --depext-only` if you want to only install external dependencies.
# Detecting depexts using vars: arch=x86_64, os=linux, os-distribution=debian, os-family=debian
# No extra OS packages requirements found.
The following actions will be performed:
  - install ocaml-manual 5.1.0

<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><><><>
Processing  1/3: [ocaml-manual.5.1.0: http]
[ERROR] Failed to get sources of ocaml-manual.5.1.0: Bad checksum

#=== ERROR while fetching sources for ocaml-manual.5.1.0 ======================#
OpamSolution.Fetch_fail("http://caml.inria.fr/distrib/ocaml-5.1/ocaml-5.1-refman-html.tar.gz (Bad checksum, expected sha256=7fde7eea5281a649dd3abe55f2e853ebafe487f21cad6aaa8f56ae1de4808d90)")


<><> Error report <><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
+- The following actions failed
| - fetch ocaml-manual 5.1.0
+- 
- No changes have been performed
# Run eval $(opam env) to update the current shell environment
'opam --cli=2.1 install ocaml-manual.5.1.0 --verbose --yes --confirm-level=unsafe-yes' failed.