hkdf 1.0.0: setup.ml uses String.lowercase
hkdf 1.0.0: setup.ml uses String.lowercase

#=== ERROR while compiling hkdf.1.0.0 =========================================#
# context              2.2.0~alpha~dev | linux/x86_64 | ocaml-variants.5.0.0+trunk | file:///home/opam/opam-repository
# path                 ~/.opam/5.0/.opam-switch/build/hkdf.1.0.0
# command              ~/.opam/opam-init/hooks/sandbox.sh build ./configure --prefix /home/opam/.opam/5.0
# exit-code            2
# env-file             ~/.opam/log/hkdf-7-91e362.env
# output-file          ~/.opam/log/hkdf-7-91e362.out
### output ###
# File "./setup.ml", line 318, characters 20-36:
# 318 |     String.compare (String.lowercase s1) (String.lowercase s2)
#                           ^^^^^^^^^^^^^^^^
# Error: Unbound value String.lowercase
pqwy/opam-repository,pirbo/opam-repository,Leonidas-from-XIV/opam-repository,fpottier/opam-repository,fpottier/opam-repository,pirbo/opam-repository,codinuum/opam-repository,jhwoodyatt/opam-repository,ocaml/opam-repository,nberth/opam-repository,codinuum/opam-repository,ocaml/opam-repository,Leonidas-from-XIV/opam-repository,nberth/opam-repository,pqwy/opam-repository,jhwoodyatt/opam-repository