An error in compiling Angora

[MoonLight-SteinsGate]

When I compile Angora with running build.sh, there is an error about mismatched types which is shown below. But I've never seen anything like this before. And I didn't make changes on the source code.

moonlight@ubuntu:~/Downloads/Angora-master$ ./build/build.sh 
++ command -v llvm-config
+ '[' -x /home/moonlight/clang+llvm/bin/llvm-config ']'
+ PREFIX=/home/moonlight/Downloads/Angora-master/bin/
+ cargo build
   Compiling angora v1.2.2 (/home/moonlight/Downloads/Angora-master/fuzzer)
error[E0308]: mismatched types
  --> fuzzer/src/executor/limit.rs:23:43
   |
23 |             let mem_limit: libc::rlim_t = size;
   |                                           ^^^^ expected u32, found u64
help: you can convert an `u64` to `u32` and panic if the converted value wouldn't fit
   |
23 |             let mem_limit: libc::rlim_t = size.try_into().unwrap();
   |                                           ^^^^^^^^^^^^^^^^^^^^^^^^

warning: use of deprecated item 'std::os::unix::process::CommandExt::before_exec': should be unsafe, use `pre_exec` instead
  --> fuzzer/src/executor/limit.rs:43:14
   |
43 |         self.before_exec(func)
   |              ^^^^^^^^^^^
   |
   = note: #[warn(deprecated)] on by default

warning: use of deprecated item 'std::os::unix::process::CommandExt::before_exec': should be unsafe, use `pre_exec` instead
  --> fuzzer/src/executor/limit.rs:53:14
   |
53 |         self.before_exec(func)
   |              ^^^^^^^^^^^

warning: use of deprecated item 'std::os::unix::process::CommandExt::before_exec': should be unsafe, use `pre_exec` instead
  --> fuzzer/src/executor/limit.rs:68:18
   |
68 |             self.before_exec(func)
   |                  ^^^^^^^^^^^

error: aborting due to previous error

For more information about this error, try `rustc --explain E0308`.
error: Could not compile `angora`.

To learn more, run the command again with --verbose.

[spinpx]

Could you provide me your rust version?

[MoonLight-SteinsGate]

Sorry, I have refreshed the system and the rust have been unloaded. So I can’t provide the rust version.

…

在 2019年12月15日，下午10:48，sp1npx ***@***.***> 写道： Can you provide me your rust version? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#76?email_source=notifications&email_token=AGLKPYAXIOZVBRKPAC3GDTTQYY7VPA5CNFSM4IVB7NJKYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOEG42WRI#issuecomment-565816133>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AGLKPYGEBARUMOXSQKMGKALQYY7VPANCNFSM4IVB7NJA>.