cannot build on macos : 'log' only in linux cfg

I could not run zeos-caterpillar-mpc on my mac

   Compiling zeos-caterpillar v0.1.0 (...../__ZKP__/ZEOS/zeos-caterpillar)
error[E0432]: unresolved import `crate::log`
  --> src/wallet.rs:20:5
   |
20 |     log
   |     ^^^ no `log` in the root
   |

I succeeded build by removing target_os macro
//#[cfg(target_os = "linux")]
pub fn log(msg: &str)
{
    println!("{}", msg);
} 