Build a substrat node template on digitalocean problem

Question

I try to cargo build the substrate node template on the server digital ocean. I have the exact same configuration between my own Ubuntu and Digitalocean droplet : Default host: x86_64-unknown-linux-gnu rustup home: /root/.rustup

installed toolchains
--------------------

stable-x86_64-unknown-linux-gnu
nightly-x86_64-unknown-linux-gnu
1.68.0-x86_64-unknown-linux-gnu
1.69.0-x86_64-unknown-linux-gnu (default)

active toolchain
----------------

1.69.0-x86_64-unknown-linux-gnu (default)
rustc 1.69.0 (84c898d65 2023-04-16).

When I cargo build the substrate node template, it works, whereas on digital ocean, I got this error :

Compiling sp-io v7.0.0 (https://github.com/paritytech/substrate?branch=polkadot-v0.9.37#946507ba)
  error[E0557]: feature has been removed
    --> /root/.cargo/git/checkouts/substrate-7e08433d4c370a21/946507b/primitives/io/src/lib.rs:22:43
     |
  22 | #![cfg_attr(not(feature = "std"), feature(alloc_error_handler))]
     |                                           ^^^^^^^^^^^^^^^^^^^ feature has been removed
     |
     = note: now handled by panic handler.

As if my version of Rust was not correct. But it is the same between my computer and digitalocean. Does anyone has any ideas ? (rustc --version rustc 1.69.0 (84c898d65 2023-04-16) in both case)

Answer 1

There are two possible solutions:

1. Either use Substrate master to include the following fix: https://github.com/paritytech/substrate/pull/13580

2. Or downgrade your rustc version to 1.68.0.