opam update

# install the haxe package dependencies (as listed in the `opam` file)
opam install haxe --deps-only

[ERROR] The compilation of luv.0.5.14 failed at "dune build -p luv -j 19".
∗ installed camlp5.8.03.00

#=== ERROR while compiling luv.0.5.14 =========================================#
# context     2.1.5 | macos/arm64 | ocaml.4.14.2 | https://opam.ocaml.org#2d4ed1d357476c1cef4ba85ee4e76e9dfb81f2ee
# path        ~/.opam/default/.opam-switch/build/luv.0.5.14
# command     ~/.opam/opam-init/hooks/sandbox.sh build dune build -p luv -j 19
# exit-code   1
# env-file    ~/.opam/log/luv-87316-a50742.env
# output-file ~/.opam/log/luv-87316-a50742.out
### output ###
# [...]
# c_generated_functions.c:1814:10: warning: initializing "char *" with an expression of type "const char *" discards qualifiers [-Wincompatible-pointer-types-discards-qualifiers]
#    char* x1408 = CTYPES_PTR_OF_OCAML_STRING(x1407);
#          ^       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# c_generated_functions.c:1835:29: warning: passing "unsigned char *" to parameter of type "char *" converts between pointers to integer types where one is of the unique plain "char" type and the other is not [-Wpointer-sign]
#    int x1424 = luv_os_uname(x1423);
#                             ^~~~~
# ./helpers.h:180:24: note: passing argument to parameter "buffer" here
# int luv_os_uname(char *buffer);
#                        ^
# 34 warnings and 2 errors generated.
# (cd _build/default/src/c/vendor/libuv && /opt/homebrew/bin/bash -e -u -o pipefail -c "sh configure --host `ocamlc -config | awk "\""/^host:/ {print $NF}"\""` "\""CC=cc -O2 -fno-strict-aliasing -fwrapv -pthread"\"" CFLAGS=-DNDEBUG --silent --enable-silent-rules")
# ld: warning: -single_module is obsolete