diff --git a/src/unix/bsd/apple/mod.rs b/src/unix/bsd/apple/mod.rs
index 56f5ad43..489afe06 100644
--- a/src/unix/bsd/apple/mod.rs
+++ b/src/unix/bsd/apple/mod.rs
@@ -2,44 +2,16 @@
 //!
 //! This covers *-apple-* triples currently
 
-pub type c_char = i8;
-pub type c_schar = i8;
-pub type c_uchar = u8;
-pub type c_short = i16;
-pub type c_ushort = u16;
-pub type c_int = i32;
-pub type c_uint = u32;
-pub type c_float = f32;
-pub type c_double = f64;
 pub type clock_t = c_ulong;
 pub type time_t = c_long;
 pub type suseconds_t = i32;
-pub type wchar_t = i32;
-pub type c_longlong = i64;
-pub type c_ulonglong = u64;
-pub type intmax_t = i64;
-pub type uintmax_t = u64;
-
-pub type off_t = i64;
 pub type dev_t = i32;
 pub type ino_t = u64;
-pub type pid_t = i32;
-pub type uid_t = u32;
-pub type gid_t = u32;
-pub type useconds_t = u32;
 pub type mode_t = u16;
 pub type ssize_t = c_long;
-
 pub type nlink_t = u16;
 pub type blksize_t = i32;
-pub type blkcnt_t = i64;
-pub type socklen_t = u32;
-pub type sa_family_t = u8;
-pub type in_port_t = u16;
-pub type in_addr_t = u32;
-pub type pthread_t = uintptr_t;
 pub type rlim_t = u64;
-pub type sighandler_t = size_t;
 pub type mach_timebase_info_data_t = mach_timebase_info;
 pub type pthread_key_t = c_ulong;
 pub type sigset_t = u32;
diff --git a/src/unix/bsd/freebsdlike/mod.rs b/src/unix/bsd/freebsdlike/mod.rs
index 11bf8302..42b15090 100644
--- a/src/unix/bsd/freebsdlike/mod.rs
+++ b/src/unix/bsd/freebsdlike/mod.rs
@@ -1,39 +1,12 @@
-pub type c_char = i8;
-pub type c_schar = i8;
-pub type c_uchar = u8;
-pub type c_short = i16;
-pub type c_ushort = u16;
-pub type c_int = i32;
-pub type c_uint = u32;
-pub type c_float = f32;
-pub type c_double = f64;
 pub type clock_t = i32;
-pub type wchar_t = i32;
-pub type c_longlong = i64;
-pub type c_ulonglong = u64;
-pub type intmax_t = i64;
-pub type uintmax_t = u64;
-pub type off_t = i64;
 pub type dev_t = u32;
 pub type ino_t = u32;
-pub type pid_t = i32;
-pub type uid_t = u32;
-pub type gid_t = u32;
-pub type useconds_t = u32;
 pub type mode_t = u16;
 pub type nlink_t = u16;
 pub type blksize_t = u32;
-pub type blkcnt_t = i64;
 pub type fflags_t = u32;
 pub type pthread_attr_t = *mut ::c_void;
-
-pub type pthread_t = uintptr_t;
 pub type rlim_t = i64;
-pub type sighandler_t = size_t;
-pub type socklen_t = u32;
-pub type sa_family_t = u8;
-pub type in_port_t = u16;
-pub type in_addr_t = u32;
 pub type pthread_mutex_t = *mut ::c_void;
 pub type pthread_mutexattr_t = *mut ::c_void;
 pub type pthread_cond_t = *mut ::c_void;
@@ -61,7 +34,7 @@ s! {
 
     pub struct sockaddr_storage {
         pub ss_len: u8,
-        pub ss_family: sa_family_t,
+        pub ss_family: ::sa_family_t,
         __ss_pad1: [u8; 6],
         __ss_align: i64,
         __ss_pad2: [u8; 112],
@@ -72,16 +45,16 @@ s! {
         pub ai_family: ::c_int,
         pub ai_socktype: ::c_int,
         pub ai_protocol: ::c_int,
-        pub ai_addrlen: socklen_t,
-        pub ai_canonname: *mut c_char,
+        pub ai_addrlen: ::socklen_t,
+        pub ai_canonname: *mut ::c_char,
         pub ai_addr: *mut ::sockaddr,
         pub ai_next: *mut addrinfo,
     }
 
     pub struct ifaddrs {
         pub ifa_next: *mut ifaddrs,
-        pub ifa_name: *mut c_char,
-        pub ifa_flags: c_uint,
+        pub ifa_name: *mut ::c_char,
+        pub ifa_flags: ::c_uint,
         pub ifa_addr: *mut ::sockaddr,
         pub ifa_netmask: *mut ::sockaddr,
         pub ifa_dstaddr: *mut ::sockaddr,
@@ -100,11 +73,11 @@ s! {
         pub si_uid: ::uid_t,
         pub si_status: ::c_int,
         pub si_addr: *mut ::c_void,
-        _pad: [c_int; 12],
+        _pad: [::c_int; 12],
     }
 
     pub struct sigaction {
-        pub sa_sigaction: sighandler_t,
+        pub sa_sigaction: ::sighandler_t,
         pub sa_flags: ::c_int,
         pub sa_mask: sigset_t,
     }
@@ -126,11 +99,11 @@ pub const SEEK_END: ::c_int = 2;
 pub const _IOFBF: ::c_int = 0;
 pub const _IONBF: ::c_int = 2;
 pub const _IOLBF: ::c_int = 1;
-pub const BUFSIZ: c_uint = 1024;
-pub const FOPEN_MAX: c_uint = 20;
-pub const FILENAME_MAX: c_uint = 1024;
-pub const L_tmpnam: c_uint = 1024;
-pub const TMP_MAX: c_uint = 308915776;
+pub const BUFSIZ: ::c_uint = 1024;
+pub const FOPEN_MAX: ::c_uint = 20;
+pub const FILENAME_MAX: ::c_uint = 1024;
+pub const L_tmpnam: ::c_uint = 1024;
+pub const TMP_MAX: ::c_uint = 308915776;
 
 pub const O_RDONLY: ::c_int = 0;
 pub const O_WRONLY: ::c_int = 1;
@@ -527,30 +500,26 @@ pub const PTHREAD_COND_INITIALIZER: pthread_cond_t = 0 as *mut _;
 pub const PTHREAD_RWLOCK_INITIALIZER: pthread_rwlock_t = 0 as *mut _;
 pub const PTHREAD_MUTEX_RECURSIVE: ::c_int = 2;
 
-pub const SIGSTKSZ: ::size_t = 34816;
-
 extern {
-    pub fn mprotect(addr: *const ::c_void, len: size_t, prot: c_int)
-                    -> c_int;
+    pub fn mprotect(addr: *const ::c_void, len: size_t, prot: ::c_int)
+                    -> ::c_int;
     pub fn shm_open(name: *const ::c_char, oflag: ::c_int, mode: ::mode_t)
                     -> ::c_int;
-    pub fn sysctl(name: *const c_int,
-                  namelen: c_uint,
+    pub fn sysctl(name: *const ::c_int,
+                  namelen: ::c_uint,
                   oldp: *mut ::c_void,
                   oldlenp: *mut size_t,
                   newp: *const ::c_void,
                   newlen: size_t)
-                  -> c_int;
-    pub fn sysctlbyname(name: *const c_char,
+                  -> ::c_int;
+    pub fn sysctlbyname(name: *const ::c_char,
                         oldp: *mut ::c_void,
                         oldlenp: *mut size_t,
                         newp: *const ::c_void,
                         newlen: size_t)
-                        -> c_int;
+                        -> ::c_int;
     pub fn clock_gettime(clk_id: ::c_int, tp: *mut ::timespec) -> ::c_int;
     pub fn pthread_set_name_np(tid: ::pthread_t, name: *const ::c_char);
-    pub fn backtrace(buf: *mut *mut ::c_void,
-                     sz: ::size_t) -> ::size_t;
 }
 
 cfg_if! {
diff --git a/src/unix/bsd/mod.rs b/src/unix/bsd/mod.rs
index 56ae7246..a7c30eab 100644
--- a/src/unix/bsd/mod.rs
+++ b/src/unix/bsd/mod.rs
@@ -1,3 +1,30 @@
+pub type c_char = i8;
+pub type c_schar = i8;
+pub type c_uchar = u8;
+pub type c_short = i16;
+pub type c_ushort = u16;
+pub type c_int = i32;
+pub type c_uint = u32;
+pub type c_float = f32;
+pub type c_double = f64;
+pub type c_longlong = i64;
+pub type c_ulonglong = u64;
+pub type wchar_t = i32;
+pub type intmax_t = i64;
+pub type uintmax_t = u64;
+pub type off_t = i64;
+pub type pid_t = i32;
+pub type uid_t = u32;
+pub type gid_t = u32;
+pub type useconds_t = u32;
+pub type blkcnt_t = i64;
+pub type socklen_t = u32;
+pub type sa_family_t = u8;
+pub type in_port_t = u16;
+pub type in_addr_t = u32;
+pub type pthread_t = uintptr_t;
+pub type sighandler_t = size_t;
+
 s! {
     pub struct sockaddr {
         pub sa_len: u8,
diff --git a/src/unix/bsd/openbsdlike/mod.rs b/src/unix/bsd/openbsdlike/mod.rs
index 1234c19b..340857d8 100644
--- a/src/unix/bsd/openbsdlike/mod.rs
+++ b/src/unix/bsd/openbsdlike/mod.rs
@@ -1,45 +1,18 @@
-pub type c_char = i8;
-pub type c_schar = i8;
-pub type c_uchar = u8;
-pub type c_short = i16;
-pub type c_ushort = u16;
-pub type c_int = i32;
-pub type c_uint = u32;
 pub type c_long = i64;
 pub type c_ulong = u64;
-pub type c_float = f32;
-pub type c_double = f64;
 pub type size_t = u64;
 pub type ptrdiff_t = i64;
 pub type clock_t = i64;
 pub type time_t = i64;
 pub type suseconds_t = i64;
-pub type wchar_t = i32;
-pub type c_longlong = i64;
-pub type c_ulonglong = u64;
 pub type intptr_t = i64;
 pub type uintptr_t = u64;
-pub type intmax_t = i64;
-pub type uintmax_t = u64;
-pub type off_t = i64;
 pub type dev_t = i32;
-pub type pid_t = i32;
-pub type uid_t = u32;
-pub type gid_t = u32;
-pub type useconds_t = u32;
 pub type mode_t = u32;
 pub type ssize_t = c_long;
-
-pub type sighandler_t = size_t;
-pub type socklen_t = u32;
-pub type sa_family_t = u8;
-pub type in_port_t = u16;
-pub type in_addr_t = u32;
-
 pub type nlink_t = uint32_t;
 pub type blksize_t = uint32_t;
 pub type ino_t = uint64_t;
-pub type blkcnt_t = i64;
 pub type fflags_t = u32;
 pub type pthread_attr_t = *mut c_void;
 pub type sigset_t = ::c_uint;
@@ -48,19 +21,12 @@ pub type pthread_mutex_t = *mut ::c_void;
 pub type pthread_mutexattr_t = *mut ::c_void;
 pub type pthread_cond_t = *mut ::c_void;
 pub type pthread_rwlock_t = *mut ::c_void;
-pub type pthread_t = uintptr_t;
 pub type rlim_t = u64;
 
 
 pub enum timezone {}
 
 s! {
-    pub struct stack_t {
-        pub ss_sp: *mut ::c_void,
-        pub ss_size: ::size_t,
-        pub ss_flags: ::c_int,
-    }
-
     pub struct siginfo_t {
         pub si_signo: ::c_int,
         pub si_code: ::c_int,
@@ -131,6 +97,12 @@ s! {
         pub st_birthtime: time_t,
         pub st_birthtime_nsec: c_long,
     }
+
+    pub struct stack_t {
+        pub ss_sp: *mut ::c_void,
+        pub ss_size: ::size_t,
+        pub ss_flags: ::c_int,
+    }
 }
 
 pub const EXIT_FAILURE : c_int = 1;