uuseg.15.1.0+dune requires uchar

[samoht]

Otherwise you get that error:

#=== ERROR while compiling uuseg.15.1.0+dune ==================================#
# context     2.1.5 | macos/arm64 |  | git+https://github.com/dune-universe/opam-overlays.git
# path        ~/git/mirage-skeleton/_opam/.opam-switch/build/uuseg.15.1.0+dune
# command     ~/.opam/opam-init/hooks/sandbox.sh build dune build -p uuseg -j 9
# exit-code   1
# env-file    ~/.opam/log/uuseg-175-9eef0f.env
# output-file ~/.opam/log/uuseg-175-9eef0f.out
### output ###
# File "src/dune", line 6, characters 12-17:
# 6 |  (libraries uchar uucp)
#                 ^^^^^
# Error: Library "uchar" not found.
# -> required by library "uuseg" in _build/default/src
# -> required by _build/default/META.uuseg
# -> required by _build/install/default/lib/uuseg/META
# -> required by _build/default/uuseg.install
# -> required by alias install

[jonahbeckford]

dune-universe/uuseg#1

After that the overlay can be added here (or just skip to https://github.com/jonahbeckford/uuseg/releases/download/v15.1.0%2Bdune2/src.tar.gz but I don't think the overlays should come from personal forks).