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user@host:~/ckb-sdk-rust-wasm-test$ sudo apt install llvm-dev libclang-dev clang lld;
user@host:~/ckb-sdk-rust-wasm-test$ cargo build --target wasm32-unknown-unknown;
   Compiling blake2b-rs v0.2.0
The following warnings were emitted during compilation:

warning: BLAKE2/ref/blake2b-ref.c:17:10: fatal error: 'string.h' file not found
warning: #include <string.h>
warning:          ^~~~~~~~~~
warning: 1 error generated.

error: failed to run custom build command for `blake2b-rs v0.2.0`

Caused by:
  process didn't exit successfully: `/home/user/ckb-sdk-rust-wasm-test/target/debug/build/blake2b-rs-fbb694b1e880f308/build-script-build` (exit status: 1)
  --- stdout
  TARGET = Some("wasm32-unknown-unknown")
  OPT_LEVEL = Some("0")
  HOST = Some("x86_64-unknown-linux-gnu")
  CC_wasm32-unknown-unknown = None
  CC_wasm32_unknown_unknown = None
  TARGET_CC = None
  CC = None
  CFLAGS_wasm32-unknown-unknown = None
  CFLAGS_wasm32_unknown_unknown = None
  TARGET_CFLAGS = None
  CFLAGS = None
  CRATE_CC_NO_DEFAULTS = None
  DEBUG = Some("true")
  running: "clang" "-O0" "-ffunction-sections" "-fdata-sections" "-fPIC" "-g" "-fno-omit-frame-pointer" "--target=wasm32-unknown-unknown" "-Wall" "-Wextra" "-o" "/home/user/ckb-sdk-rust-wasm-test/target/wasm32-unknown-unknown/debug/build/blake2b-rs-63f6b231df7e98c0/out/BLAKE2/ref/blake2b-ref.o" "-c" "BLAKE2/ref/blake2b-ref.c"
  cargo:warning=BLAKE2/ref/blake2b-ref.c:17:10: fatal error: 'string.h' file not found
  cargo:warning=#include <string.h>
  cargo:warning=         ^~~~~~~~~~
  cargo:warning=1 error generated.
  exit status: 1

  --- stderr


  error occurred: Command "clang" "-O0" "-ffunction-sections" "-fdata-sections" "-fPIC" "-g" "-fno-omit-frame-pointer" "--target=wasm32-unknown-unknown" "-Wall" "-Wextra" "-o" "/home/user/ckb-sdk-rust-wasm-test/target/wasm32-unknown-unknown/debug/build/blake2b-rs-63f6b231df7e98c0/out/BLAKE2/ref/blake2b-ref.o" "-c" "BLAKE2/ref/blake2b-ref.c" with args "clang" did not execute successfully (status code exit status: 1).