error[E0433]: failed to resolve: use of undeclared crate or module `libc`
  --> /usr/pkgsrc/wip/xh/work/vendor/network-interface-1.0.0/src/target/getifaddrs.rs:25:18
   |
25 |         unsafe { libc::freeifaddrs(self.base) }
   |                  ^^^^ use of undeclared crate or module `libc`

error[E0433]: failed to resolve: use of undeclared crate or module `libc`
  --> /usr/pkgsrc/wip/xh/work/vendor/network-interface-1.0.0/src/target/getifaddrs.rs:31:20
   |
31 |     match unsafe { libc::getifaddrs(addr.as_mut_ptr()) } {
   |                    ^^^^ use of undeclared crate or module `libc`

error[E0433]: failed to resolve: use of undeclared crate or module `libc`
 --> /usr/pkgsrc/wip/xh/work/vendor/network-interface-1.0.0/src/target/getifaddrs.rs:5:16
  |
5 |     base: *mut libc::ifaddrs,
  |                ^^^^ use of undeclared crate or module `libc`

error[E0433]: failed to resolve: use of undeclared crate or module `libc`
 --> /usr/pkgsrc/wip/xh/work/vendor/network-interface-1.0.0/src/target/getifaddrs.rs:6:16
  |
6 |     next: *mut libc::ifaddrs,
  |                ^^^^ use of undeclared crate or module `libc`

error[E0433]: failed to resolve: use of undeclared crate or module `libc`
  --> /usr/pkgsrc/wip/xh/work/vendor/network-interface-1.0.0/src/target/getifaddrs.rs:10:17
   |
10 |     type Item = libc::ifaddrs;
   |                 ^^^^ use of undeclared crate or module `libc`

error[E0433]: failed to resolve: use of undeclared crate or module `libc`
  --> /usr/pkgsrc/wip/xh/work/vendor/network-interface-1.0.0/src/target/getifaddrs.rs:30:44
   |
30 |     let mut addr = mem::MaybeUninit::<*mut libc::ifaddrs>::uninit();
   |                                            ^^^^ use of undeclared crate or module `libc`

For more information about this error, try `rustc --explain E0433`.
error: could not compile `network-interface` (lib) due to 6 previous errors
warning: build failed, waiting for other jobs to finish...
*** Error code 101

Stop.
make[1]: stopped in /usr/pkgsrc/wip/xh
*** Error code 1

Stop.