Problem compiling rsdd, missing `rustup-init`

[cogumbreiro]

I'm struggling to build rsdd in Linux. Currently the build fails because it's the file rustup-init is missing. I do have rustup up to date. Any idea how what's going on?

Output of: opam install rsdd

$ opam install rsdd     
The following actions will be performed:
  ∗ install rsdd 0.1.0
<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><><><>
⬇ retrieved rsdd.0.1.0  (cached)
[ERROR] The compilation of rsdd.0.1.0 failed at "dune build -p rsdd -j 15
        @install".

#=== ERROR while compiling rsdd.0.1.0 =========================================#
# context     2.1.2 | linux/x86_64 | ocaml.4.14.1 | https://opam.ocaml.org#cbef5a5f
# path        ~/.opam/default/.opam-switch/build/rsdd.0.1.0
# command     ~/.opam/opam-init/hooks/sandbox.sh build dune build -p rsdd -j 15 @install
# exit-code   1
# env-file    ~/.opam/log/rsdd-808108-bce313.env
# output-file ~/.opam/log/rsdd-808108-bce313.out
### output ###
# File "src/dune", line 1, characters 0-391:
# [...]
#  2 |  (targets librsdd.a dllrsdd.so)
#  3 |  (deps
#  4 |   (glob_files *.rs))
#  5 |  (action
#  6 |   (progn
#  7 |    (run sh -c "cd %{project_root}/../.. && cargo build --release")
#  8 |    (run sh -c
#  9 |      "mv %{project_root}/../../target/release/librsdd.so ./dllrsdd.so 2> /dev/null || mv %{project_root}/../../target/release/librsdd.dylib ./dllrsdd.so")
# 10 |    (run mv %{project_root}/../../target/release/librsdd.a librsdd.a))))
# (cd _build/default/src && /usr/bin/sh -c 'cd ../../.. && cargo build --release')
# error: could not remove 'setup' file: '/home/tiago/.cargo/bin/rustup-init': Read-only file system (os error 30)

FYI, I believe I am in the latest version of rustup:

$ rustup self update
info: checking for self-update
  rustup unchanged - 1.26.0