cannot find value `O_NOFOLLOW` in crate `libc`

[greenpdx]

Bug description

cargo build
Compiling std v0.0.0 (/home/svvs/.rustup/toolchains/nightly-aarch64-unknown-linux-gnu/lib/rustlib/src/rust/library/std)
Compiling esp-idf-sys v0.36.1
error[E0425]: cannot find value O_NOFOLLOW in crate libc
--> /home/svvs/.rustup/toolchains/nightly-aarch64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/sys/fs/mod.rs:122:43
|
122 | OpenOptions::new().custom_flags(libc::O_NOFOLLOW).open(path)?.set_permissions(perm)
| ^^^^^^^^^^ not found in libc

For more information about this error, try rustc --explain E0425.
error: could not compile std (lib) due to 1 previous error
warning: build failed, waiting for other jobs to finish...
warning: esp-idf-sys@0.36.1: Building against ESP-IDF version (5.5.0) is not officially supported. Supported versions are 'v5.3(.X)', 'v5.2(.X)', 'v5.1(.X)', 'v5.0(.X)', 'v4.4(.X)'
error: failed to run custom build command for esp-idf-sys v0.36.1

• Would you like to work on a fix? y, not I know nothing about esp-idf-sys

To Reproduce

1. $ cargo generate esp-rs/esp-idf-template cargo, No advance options
2. $ cargo build

cargo build
Compiling std v0.0.0 (/home/svvs/.rustup/toolchains/nightly-aarch64-unknown-linux-gnu/lib/rustlib/src/rust/library/std)
Compiling esp-idf-sys v0.36.1
error[E0425]: cannot find value O_NOFOLLOW in crate libc
--> /home/svvs/.rustup/toolchains/nightly-aarch64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/sys/fs/mod.rs:122:43
|
122 | OpenOptions::new().custom_flags(libc::O_NOFOLLOW).open(path)?.set_permissions(perm)
| ^^^^^^^^^^ not found in libc

warning: esp-idf-sys@0.36.1: Building against ESP-IDF version (6.0.0) is not officially supported. Supported versions are 'v5.3(.X)', 'v5.2(.X)', 'v5.1(.X)', 'v5.0(.X)', 'v4.4(.X)'
error: failed to run custom build command for esp-idf-sys v0.36.1

Expected behavior

Should build

Environment

esp-idf-sys v0.36.1
target esp32c3 Seeed Xiao
Linux raspberrypi 6.12.34+rpt-rpi-2712 #1 SMP PREEMPT Debian 1:6.12.34-1+rpt1~bookworm (2025-06-26) aarch64 GNU/Linux

• Crate (esp-idf-sys) version: [e.g. 0.35.0; type master if you use the crate from the GIT master branch]
• ESP-IDF branch or tag: [e.g. release/v5.2, v5.2.1, etc.]
• Target device (MCU): [e.g. esp32s3]
• OS: [e.g. Ubuntu 20.04]

[ivmarkov]

Use an older nightly rust, or just switch to the esp toolchain until this is fixed.

[greenpdx]

How do I switch to the esp tool chain? I want esp32c3 build_std. I have looked at https://doc.rust-lang.org/nightly/rustc/platform-support/esp-idf.html. but where do I add these configs?

[ivmarkov]

How do I switch to the esp tool chain? I want esp32c3 build_std. I have looked at https://doc.rust-lang.org/nightly/rustc/platform-support/esp-idf.html. but where do I add these configs?

This.

Basically:

cargo install espup
espup install
rustup default esp

and make sure you don't have a rust-toolchain.toml in your binary crate root that overrides the rustup default with "nightly". If you do, remove that file or change inside it "nightly" to "esp".