Unable to build with openssl

[haraldkri]

For context i am quite new to rust. I am trying to run an opcua server on an esp32-c6.
I am currently failing to build the project after installing opcua. If i understood the docu correctly there should be not need to install riscv32imac-esp-espidf manually. So yeah, i am kinda stuck as to what to do here as i can't really find a solution online. Any help is appreciated!

error: failed to run custom build command for `openssl-sys v0.9.104`
Caused by:
  process didn't exit successfully: `/Users/confusedBeing/Development/rust-esp32-c6-blink/target/debug/build/openssl-sys-c5303785ae079004/build-script-main` (exit status: 1)
  --- stdout
  cargo:rustc-check-cfg=cfg(osslconf, values("OPENSSL_NO_OCB", "OPENSSL_NO_SM4", "OPENSSL_NO_SEED", "OPENSSL_NO_CHACHA", "OPENSSL_NO_CAST", "OPENSSL_NO_IDEA", "OPENSSL_NO_CAMELLIA", "OPENSSL_NO_RC4", "OPENSSL_NO_BF", "OPENSSL_NO_PSK", "OPENSSL_NO_DEPRECATED_3_0", "OPENSSL_NO_SCRYPT", "OPENSSL_NO_SM3", "OPENSSL_NO_RMD160", "OPENSSL_NO_EC2M", "OPENSSL_NO_OCSP", "OPENSSL_NO_CMS", "OPENSSL_NO_COMP", "OPENSSL_NO_SOCK", "OPENSSL_NO_STDIO", "OPENSSL_NO_EC", "OPENSSL_NO_SSL3_METHOD", "OPENSSL_NO_KRB5", "OPENSSL_NO_TLSEXT", "OPENSSL_NO_SRP", "OPENSSL_NO_RFC3779", "OPENSSL_NO_SHA", "OPENSSL_NO_NEXTPROTONEG", "OPENSSL_NO_ENGINE", "OPENSSL_NO_BUF_FREELISTS"))
  cargo:rustc-check-cfg=cfg(openssl)
  cargo:rustc-check-cfg=cfg(libressl)
  cargo:rustc-check-cfg=cfg(boringssl)
  cargo:rustc-check-cfg=cfg(libressl250)
  cargo:rustc-check-cfg=cfg(libressl251)
  cargo:rustc-check-cfg=cfg(libressl252)
  cargo:rustc-check-cfg=cfg(libressl261)
  cargo:rustc-check-cfg=cfg(libressl270)
  cargo:rustc-check-cfg=cfg(libressl271)
  cargo:rustc-check-cfg=cfg(libressl273)
  cargo:rustc-check-cfg=cfg(libressl280)
  cargo:rustc-check-cfg=cfg(libressl281)
  cargo:rustc-check-cfg=cfg(libressl291)
  cargo:rustc-check-cfg=cfg(libressl310)
  cargo:rustc-check-cfg=cfg(libressl321)
  cargo:rustc-check-cfg=cfg(libressl332)
  cargo:rustc-check-cfg=cfg(libressl340)
  cargo:rustc-check-cfg=cfg(libressl350)
  cargo:rustc-check-cfg=cfg(libressl360)
  cargo:rustc-check-cfg=cfg(libressl361)
  cargo:rustc-check-cfg=cfg(libressl370)
  cargo:rustc-check-cfg=cfg(libressl380)
  cargo:rustc-check-cfg=cfg(libressl381)
  cargo:rustc-check-cfg=cfg(libressl382)
  cargo:rustc-check-cfg=cfg(libressl390)
  cargo:rustc-check-cfg=cfg(libressl400)
  cargo:rustc-check-cfg=cfg(ossl101)
  cargo:rustc-check-cfg=cfg(ossl102)
  cargo:rustc-check-cfg=cfg(ossl102f)
  cargo:rustc-check-cfg=cfg(ossl102h)
  cargo:rustc-check-cfg=cfg(ossl110)
  cargo:rustc-check-cfg=cfg(ossl110f)
  cargo:rustc-check-cfg=cfg(ossl110g)
  cargo:rustc-check-cfg=cfg(ossl110h)
  cargo:rustc-check-cfg=cfg(ossl111)
  cargo:rustc-check-cfg=cfg(ossl111b)
  cargo:rustc-check-cfg=cfg(ossl111c)
  cargo:rustc-check-cfg=cfg(ossl111d)
  cargo:rustc-check-cfg=cfg(ossl300)
  cargo:rustc-check-cfg=cfg(ossl310)
  cargo:rustc-check-cfg=cfg(ossl320)
  cargo:rustc-check-cfg=cfg(ossl330)
  cargo:rustc-check-cfg=cfg(ossl340)
  cargo:rerun-if-env-changed=RISCV32IMAC_ESP_ESPIDF_OPENSSL_NO_VENDOR
  RISCV32IMAC_ESP_ESPIDF_OPENSSL_NO_VENDOR unset
  cargo:rerun-if-env-changed=OPENSSL_NO_VENDOR
  OPENSSL_NO_VENDOR unset
  cargo:rerun-if-env-changed=RISCV32IMAC_ESP_ESPIDF_OPENSSL_CONFIG_DIR
  RISCV32IMAC_ESP_ESPIDF_OPENSSL_CONFIG_DIR unset
  cargo:rerun-if-env-changed=OPENSSL_CONFIG_DIR
  OPENSSL_CONFIG_DIR unset
  cargo:warning=openssl-src: failed to build OpenSSL from source
  --- stderr
  don't know how to configure OpenSSL for riscv32imac-esp-espidf

my Cargo.toml

[package]
name = "confused-opcua"
version = "0.1.0"
edition = "2021"
resolver = "2"
rust-version = "1.77"

[[bin]]
name = "confused-opcua"
harness = false # do not use the built in cargo test harness -> resolve rust-analyzer errors

[profile.release]
opt-level = "s"

[profile.dev]
debug = true    # Symbols are nice and they don't increase the size on Flash
opt-level = "z"

[features]
default = []
pio = ["esp-idf-svc/pio"]
experimental = ["esp-idf-svc/experimental"]
vendored-openssl = ["opcua/vendored-openssl"]

[dependencies]
log = "0.4"
esp-idf-svc = { version = "0.49", features = ["critical-section", "embassy-time-driver", "embassy-sync"] }
esp-idf-sys = { version = "0.35.0", features = ["binstart"] }
esp-idf-hal = "0.44.1"
esp-println = { version = "0.12.0", features = ["esp32c6"] }
embedded-hal = "1.0.0"
embedded-svc = "0.28.0"
heapless = "0.8.0"
dotenv = "0.15.0"
opcua = { version = "0.12.0", features = ["server", "vendored-openssl"] }
openssl = { version = "0.10", features = ["vendored"] }

[build-dependencies]
embuild = "0.32.0"
cc = "1.2.4"

my rust-toolchain.toml

[toolchain]
channel = "esp" 
components = ["rust-src"]

[ivmarkov]

openssl is not supported with esp-idf-sys. mbedtls is.
Whatever you try to port to the esp, keep in mind that the chip has < 400KB RAM, of which available to you (after wifi and other stacks are initialized) will be 200 - 250?KB at most.