docs: Add install clang requirement, revm v3.5.0 failed to build in Ubuntu

[HadiEsna]

I tried to build this repo on my ubuntu server and it failed. See below for more information. I also tried this in another linux server. Same results.

• Steps to reproduce :
  git clone git@github.com:bluealloy/revm.git
cd revm/
cargo build --release

• The error that I got :

error: failed to run custom build command for `c-kzg v0.1.1`
note: To improve backtraces for build dependencies, set the CARGO_PROFILE_RELEASE_BUILD_OVERRIDE_DEBUG=true environment variable to enable debug information generation.

Caused by:
  process didn't exit successfully: `/root/source/revm/target/release/build/c-kzg-a2b11cbb8c293f53/build-script-build` (exit status: 101)
  --- stdout
  TARGET = Some("x86_64-unknown-linux-gnu")
  OPT_LEVEL = Some("3")
  HOST = Some("x86_64-unknown-linux-gnu")
  cargo:rerun-if-env-changed=CC_x86_64-unknown-linux-gnu
  CC_x86_64-unknown-linux-gnu = None
  cargo:rerun-if-env-changed=CC_x86_64_unknown_linux_gnu
  CC_x86_64_unknown_linux_gnu = None
  cargo:rerun-if-env-changed=HOST_CC
  HOST_CC = None
  cargo:rerun-if-env-changed=CC
  CC = None
  cargo:rerun-if-env-changed=CRATE_CC_NO_DEFAULTS
  CRATE_CC_NO_DEFAULTS = None
  DEBUG = Some("false")
  CARGO_CFG_TARGET_FEATURE = Some("fxsr,sse,sse2")
  cargo:rerun-if-env-changed=CFLAGS_x86_64-unknown-linux-gnu
  CFLAGS_x86_64-unknown-linux-gnu = None
  cargo:rerun-if-env-changed=CFLAGS_x86_64_unknown_linux_gnu
  CFLAGS_x86_64_unknown_linux_gnu = None
  cargo:rerun-if-env-changed=HOST_CFLAGS
  HOST_CFLAGS = None
  cargo:rerun-if-env-changed=CFLAGS
  CFLAGS = None
  running: "cc" "-O3" "-ffunction-sections" "-fdata-sections" "-fPIC" "-m64" "-I" "/root/.cargo/registry/src/index.crates.io-6f17d22bba15001f/c-kzg-0.1.1/c-kzg-sys/blst/bindings" "-DLIB_PREFIX=ckzg" "-DFIELD_ELEMENTS_PER_BLOB=4096" "-o" "/root/source/revm/target/release/build/c-kzg-90aa3497317bc9dc/out/43c0e3c2ddb1f165-c_kzg_4844.o" "-c" "/root/.cargo/registry/src/index.crates.io-6f17d22bba15001f/c-kzg-0.1.1/c-kzg-sys/src/c_kzg_4844.c"
  exit status: 0
  cargo:rerun-if-env-changed=AR_x86_64-unknown-linux-gnu
  AR_x86_64-unknown-linux-gnu = None
  cargo:rerun-if-env-changed=AR_x86_64_unknown_linux_gnu
  AR_x86_64_unknown_linux_gnu = None
  cargo:rerun-if-env-changed=HOST_AR
  HOST_AR = None
  cargo:rerun-if-env-changed=AR
  AR = None
  cargo:rerun-if-env-changed=ARFLAGS_x86_64-unknown-linux-gnu
  ARFLAGS_x86_64-unknown-linux-gnu = None
  cargo:rerun-if-env-changed=ARFLAGS_x86_64_unknown_linux_gnu
  ARFLAGS_x86_64_unknown_linux_gnu = None
  cargo:rerun-if-env-changed=HOST_ARFLAGS
  HOST_ARFLAGS = None
  cargo:rerun-if-env-changed=ARFLAGS
  ARFLAGS = None
  running: ZERO_AR_DATE="1" "ar" "cq" "/root/source/revm/target/release/build/c-kzg-90aa3497317bc9dc/out/libckzg.a" "/root/source/revm/target/release/build/c-kzg-90aa3497317bc9dc/out/43c0e3c2ddb1f165-c_kzg_4844.o"
  exit status: 0
  running: "ar" "s" "/root/source/revm/target/release/build/c-kzg-90aa3497317bc9dc/out/libckzg.a"
  exit status: 0
  cargo:rustc-link-lib=static=ckzg
  cargo:rustc-link-search=native=/root/source/revm/target/release/build/c-kzg-90aa3497317bc9dc/out
  cargo:rerun-if-env-changed=TARGET
  cargo:rerun-if-env-changed=BINDGEN_EXTRA_CLANG_ARGS_x86_64-unknown-linux-gnu
  cargo:rerun-if-env-changed=BINDGEN_EXTRA_CLANG_ARGS_x86_64_unknown_linux_gnu
  cargo:rerun-if-env-changed=BINDGEN_EXTRA_CLANG_ARGS

[rakita]

Try installing llvm/clang, c-kzg is a C lib so it is required, if you don't need Cancun you can disable it as it is behind a c-kzg feature.

[HadiEsna]

Thanks
It was solved by running apt install clang
maybe you could add it to the readme since others might not have this pre-installed
Thanks for the help

[yash-atreya]

@rakita I can take this

I have an ubuntu bare metal as well.

[rakita]

@rakita I can take this

I have an ubuntu bare metal as well.

This is just adding one line to main README.md, go for it

[yash-atreya]

It ain't much but it's honest work.