mod ffi {
    use libc::{c_void, size_t};

    #[allow(non_camel_case_types)]
    type XXH32_hash_t = u32;

    #[allow(non_camel_case_types)]
    type XXH64_hash_t = u64;

    extern "C" {
        pub fn XXH32(input: *const c_void, length: size_t, seed: u32) -> XXH32_hash_t;
        pub fn XXH64(input: *const c_void, length: size_t, seed: u64) -> XXH64_hash_t;
    }
}

pub fn hash32(data: &[u8], seed: u32) -> u32 {
    unsafe { ffi::XXH32(data.as_ptr() as *const libc::c_void, data.len(), seed) }
}

pub fn hash64(data: &[u8], seed: u64) -> u64 {
    unsafe { ffi::XXH64(data.as_ptr() as *const libc::c_void, data.len(), seed) }
}

mod ffi {
    use libc::{c_void, size_t, uint32_t, uint64_t};

    #[allow(non_camel_case_types)]
    type XXH32_hash_t = uint32_t;

    #[allow(non_camel_case_types)]
    type XXH64_hash_t = uint64_t;

    extern "C" {
        pub fn XXH32(input: *const c_void, length: size_t, seed: uint32_t) -> XXH32_hash_t;
        pub fn XXH64(input: *const c_void, length: size_t, seed: uint64_t) -> XXH64_hash_t;
    }
}

pub fn hash32(data: &[u8], seed: u32) -> u32 {
    unsafe { ffi::XXH32(data.as_ptr() as *const libc::c_void, data.len(), seed) }
}

pub fn hash64(data: &[u8], seed: u64) -> u64 {
    unsafe { ffi::XXH64(data.as_ptr() as *const libc::c_void, data.len(), seed) }
}

--- 
+++ 
@@ -1,15 +1,15 @@
 mod ffi {
-    use libc::{c_void, size_t};
+    use libc::{c_void, size_t, uint32_t, uint64_t};
 
     #[allow(non_camel_case_types)]
-    type XXH32_hash_t = u32;
+    type XXH32_hash_t = uint32_t;
 
     #[allow(non_camel_case_types)]
-    type XXH64_hash_t = u64;
+    type XXH64_hash_t = uint64_t;
 
     extern "C" {
-        pub fn XXH32(input: *const c_void, length: size_t, seed: u32) -> XXH32_hash_t;
-        pub fn XXH64(input: *const c_void, length: size_t, seed: u64) -> XXH64_hash_t;
+        pub fn XXH32(input: *const c_void, length: size_t, seed: uint32_t) -> XXH32_hash_t;
+        pub fn XXH64(input: *const c_void, length: size_t, seed: uint64_t) -> XXH64_hash_t;
     }
 }
 
Remove usages of deprecated libc types
