Using sudo inside the Makefile doesn't work if Rust is installed through rustup

[ManifoldFR]

Describe the bug

I'm a Rust developer, and have installed Rust through rustup (https://rustup.rs) already, so it's not considered a system utility (it's not inside /usr/bin or /usr/local/bin) and not available inside the default sudo PATH. Rather, it's inside my home at ~/.cargo/bin.

Thus, running the Makefile through make calls sudo cargo, which will not exist inside the sudo'ed PATH.
So you get an error saying cargo doesn't exist.

One has to set the PATH inside a sudo using

sudo PATH=$PATH your-command

So you would have to replace sudo cargo build by sudo PATH=$PATH cargo build inside the Makefile.

An alternative is to remove calls to sudo within the Makefile and instead do a sudo -s before running it, or do sudo PATH=$PATH make install.