diff --git a/chroot/chroot.rs b/chroot/chroot.rs
index 5d22cdccb..dfd6177ff 100644
--- a/chroot/chroot.rs
+++ b/chroot/chroot.rs
@@ -20,17 +20,17 @@ use libc::funcs::posix88::unistd::{execvp, setuid, setgid};
 #[path = "../common/c_types.rs"] mod c_types;
 
 extern {
-    fn chroot(path: *libc::c_char) -> libc::c_int;
+    fn chroot(path: *const libc::c_char) -> libc::c_int;
 }
 
 #[cfg(target_os = "macos")]
 extern {
-    fn setgroups(size: libc::c_int, list: *libc::gid_t) -> libc::c_int;
+    fn setgroups(size: libc::c_int, list: *const libc::gid_t) -> libc::c_int;
 }
 
 #[cfg(target_os = "linux")]
 extern {
-    fn setgroups(size: libc::size_t, list: *libc::gid_t) -> libc::c_int;
+    fn setgroups(size: libc::size_t, list: *const libc::gid_t) -> libc::c_int;
 }
 
 static NAME: &'static str = "chroot";
@@ -92,9 +92,9 @@ pub fn uumain(args: Vec<String>) -> int {
 
     unsafe {
         let executable = command.get(0).as_slice().to_c_str().unwrap();
-        let mut commandParts: Vec<*i8> = command.iter().map(|x| x.to_c_str().unwrap()).collect();
+        let mut commandParts: Vec<*const i8> = command.iter().map(|x| x.to_c_str().unwrap()).collect();
         commandParts.push(std::ptr::null());
-        execvp(executable as *libc::c_char, commandParts.as_ptr() as **libc::c_char) as int
+        execvp(executable as *const libc::c_char, commandParts.as_ptr() as *mut *const libc::c_char) as int
     }
 }
 
@@ -129,7 +129,7 @@ fn enter_chroot(root: &Path) {
         crash!(1, "cannot chdir to {}", rootStr)
     };
     let err = unsafe {
-        chroot(".".to_c_str().unwrap() as *libc::c_char)
+        chroot(".".to_c_str().unwrap() as *const libc::c_char)
     };
     if err != 0 {
         crash!(1, "cannot chroot to {}: {:s}", rootStr, strerror(err).as_slice())
@@ -194,7 +194,7 @@ fn set_user(user: &str) {
 fn strerror(errno: i32) -> String {
     unsafe {
         let err = libc::funcs::c95::string::strerror(errno);
-        std::str::raw::from_c_str(err)
+        std::str::raw::from_c_str(err as *const i8)
     }
 }
 
diff --git a/common/c_types.rs b/common/c_types.rs
index b8c16e43f..9a42b8ce5 100644
--- a/common/c_types.rs
+++ b/common/c_types.rs
@@ -14,32 +14,32 @@ use self::libc::funcs::posix88::unistd::getgroups;
 use std::vec::Vec;
 
 use std::os;
-use std::ptr::read;
+use std::ptr::{mut_null, read};
 use std::str::raw::from_c_str;
 
 #[cfg(target_os = "macos")]
 pub struct c_passwd {
-    pub pw_name:    *c_char,    /* user name */
-    pub pw_passwd:  *c_char,    /* user name */
+    pub pw_name:    *const c_char,    /* user name */
+    pub pw_passwd:  *const c_char,    /* user name */
     pub pw_uid:     uid_t,      /* user uid */
     pub pw_gid:     gid_t,      /* user gid */
     pub pw_change:  time_t,
-    pub pw_class:   *c_char,
-    pub pw_gecos:   *c_char,
-    pub pw_dir:     *c_char,
-    pub pw_shell:   *c_char,
+    pub pw_class:   *const c_char,
+    pub pw_gecos:   *const c_char,
+    pub pw_dir:     *const c_char,
+    pub pw_shell:   *const c_char,
     pub pw_expire:  time_t
 }
 
 #[cfg(target_os = "linux")]
 pub struct c_passwd {
-    pub pw_name:    *c_char,    /* user name */
-    pub pw_passwd:  *c_char,    /* user name */
+    pub pw_name:    *const c_char,    /* user name */
+    pub pw_passwd:  *const c_char,    /* user name */
     pub pw_uid:     uid_t,      /* user uid */
     pub pw_gid:     gid_t,      /* user gid */
-    pub pw_gecos:   *c_char,
-    pub pw_dir:     *c_char,
-    pub pw_shell:   *c_char,
+    pub pw_gecos:   *const c_char,
+    pub pw_dir:     *const c_char,
+    pub pw_shell:   *const c_char,
 }
 
 #[cfg(target_os = "macos")]
@@ -62,10 +62,10 @@ pub struct utsname {
 }
 
 pub struct c_group {
-    pub gr_name:   *c_char,  // group name
-    pub gr_passwd: *c_char,  // password
+    pub gr_name:   *const c_char,  // group name
+    pub gr_passwd: *const c_char,  // password
     pub gr_gid:    gid_t,    // group id
-    pub gr_mem:    **c_char, // member list
+    pub gr_mem:    *const *const c_char, // member list
 }
 
 pub struct c_tm {
@@ -81,11 +81,11 @@ pub struct c_tm {
 }
 
 extern {
-    pub fn getpwuid(uid: uid_t) -> *c_passwd;
-    pub fn getpwnam(login: *c_char) -> *c_passwd;
-    pub fn getgrgid(gid: gid_t) -> *c_group;
-    pub fn getgrnam(name: *c_char) -> *c_group;
-    pub fn getgrouplist(name: *c_char,
+    pub fn getpwuid(uid: uid_t) -> *const c_passwd;
+    pub fn getpwnam(login: *const c_char) -> *const c_passwd;
+    pub fn getgrgid(gid: gid_t) -> *const c_group;
+    pub fn getgrnam(name: *const c_char) -> *const c_group;
+    pub fn getgrouplist(name: *const c_char,
                         gid: gid_t,
                         groups: *mut gid_t,
                         ngroups: *mut c_int) -> c_int;
@@ -93,7 +93,7 @@ extern {
 
 #[cfg(target_os = "macos")]
 extern {
-    pub fn getgroupcount(name: *c_char, gid: gid_t) -> int32_t;
+    pub fn getgroupcount(name: *const c_char, gid: gid_t) -> int32_t;
 }
 
 pub fn get_pw_from_args(free: &Vec<String>) -> Option<c_passwd> {
@@ -114,7 +114,7 @@ pub fn get_pw_from_args(free: &Vec<String>) -> Option<c_passwd> {
         // Passed the username as a string
         } else {
             let pw_pointer = unsafe {
-                getpwnam(username.as_slice().to_c_str().unwrap() as *libc::c_char)
+                getpwnam(username.as_slice().to_c_str().unwrap() as *const libc::c_char)
             };
             if pw_pointer.is_not_null() {
                 Some(unsafe { read(pw_pointer) })
@@ -131,7 +131,7 @@ pub fn get_group(groupname: &str) -> Option<c_group> {
     let group = if groupname.chars().all(|c| c.is_digit()) {
         unsafe { getgrgid(from_str::<gid_t>(groupname).unwrap()) }
     } else {
-        unsafe { getgrnam(groupname.to_c_str().unwrap() as *c_char) }
+        unsafe { getgrnam(groupname.to_c_str().unwrap() as *const c_char) }
     };
 
     if group.is_not_null() {
@@ -142,7 +142,7 @@ pub fn get_group(groupname: &str) -> Option<c_group> {
     }
 }
 
-pub fn get_group_list(name: *c_char, gid: gid_t) -> Vec<gid_t> {
+pub fn get_group_list(name: *const c_char, gid: gid_t) -> Vec<gid_t> {
     let mut ngroups: c_int = 32;
     let mut groups: Vec<gid_t> = Vec::with_capacity(ngroups as uint);
 
@@ -159,12 +159,12 @@ pub fn get_group_list(name: *c_char, gid: gid_t) -> Vec<gid_t> {
 
 #[cfg(target_os = "linux")]
 #[inline(always)]
-unsafe fn get_group_list_internal(name: *c_char, gid: gid_t, groups: *mut gid_t, grcnt: *mut c_int) -> c_int {
+unsafe fn get_group_list_internal(name: *const c_char, gid: gid_t, groups: *mut gid_t, grcnt: *mut c_int) -> c_int {
     getgrouplist(name, gid, groups, grcnt)
 }
 
 #[cfg(target_os = "macos")]
-unsafe fn get_group_list_internal(name: *c_char, gid: gid_t, groups: *mut gid_t, grcnt: *mut c_int) -> c_int {
+unsafe fn get_group_list_internal(name: *const c_char, gid: gid_t, groups: *mut gid_t, grcnt: *mut c_int) -> c_int {
     let ngroups = getgroupcount(name, gid);
     let oldsize = *grcnt;
     *grcnt = ngroups;
@@ -177,7 +177,7 @@ unsafe fn get_group_list_internal(name: *c_char, gid: gid_t, groups: *mut gid_t,
 }
 
 pub fn get_groups() -> Result<Vec<gid_t>, int> {
-    let ngroups = unsafe { getgroups(0, 0 as *mut gid_t) };
+    let ngroups = unsafe { getgroups(0, mut_null()) };
     if ngroups == -1 {
         return Err(os::errno());
     }
diff --git a/echo/echo.rs b/echo/echo.rs
index ebdfbc470..ea7239b8d 100644
--- a/echo/echo.rs
+++ b/echo/echo.rs
@@ -97,7 +97,7 @@ fn parse_options(args: Vec<String>, options: &mut EchoOptions) -> Option<Vec<Str
             _ => {
                 if arg.len() > 1 && arg.as_slice().char_at(0) == '-' {
                     let mut newopts = options.clone();
-                    let argptr: *String = &arg;  // escape from the borrow checker
+                    let argptr: *const String = &arg;  // escape from the borrow checker
                     for ch in unsafe { (*argptr).as_slice() }.chars().skip(1) {
                         match ch {
                             'h' => {
diff --git a/hostname/hostname.rs b/hostname/hostname.rs
index 9d35c306c..632f73e3d 100644
--- a/hostname/hostname.rs
+++ b/hostname/hostname.rs
@@ -19,17 +19,17 @@ use std::str;
 use getopts::{optflag, getopts, usage};
 
 extern {
-    fn gethostname(name: *libc::c_char, namelen: libc::size_t) -> libc::c_int;
+    fn gethostname(name: *mut libc::c_char, namelen: libc::size_t) -> libc::c_int;
 }
 
 #[cfg(target_os = "macos")]
 extern {
-    fn sethostname(name: *libc::c_char, namelen: libc::c_int) -> libc::c_int;
+    fn sethostname(name: *const libc::c_char, namelen: libc::c_int) -> libc::c_int;
 }
 
 #[cfg(target_os = "linux")]
 extern {
-    fn sethostname(name: *libc::c_char, namelen: libc::size_t) -> libc::c_int;
+    fn sethostname(name: *const libc::c_char, namelen: libc::size_t) -> libc::c_int;
 }
 
 pub fn uumain(args: Vec<String>) -> int {
@@ -92,7 +92,7 @@ fn xgethostname() -> String {
     let mut name = Vec::from_elem(namelen, 0u8);
 
     let err = unsafe {
-        gethostname (name.as_mut_ptr() as *libc::c_char,
+        gethostname (name.as_mut_ptr() as *mut libc::c_char,
                                         namelen as libc::size_t)
     };
 
diff --git a/id/id.rs b/id/id.rs
index 4ddcde852..8e9d33176 100644
--- a/id/id.rs
+++ b/id/id.rs
@@ -72,12 +72,12 @@ mod audit {
     pub type c_auditinfo_addr_t = c_auditinfo_addr;
 
     extern {
-        pub fn getaudit(auditinfo_addr: *c_auditinfo_addr_t) -> c_int;
+        pub fn getaudit(auditinfo_addr: *mut c_auditinfo_addr_t) -> c_int;
     }
 }
 
 extern {
-    fn getgrgid(gid: uid_t) -> *c_group;
+    fn getgrgid(gid: uid_t) -> *const c_group;
 }
 
 static NAME: &'static str = "id";
@@ -198,7 +198,7 @@ fn pretty(possible_pw: Option<c_passwd>) {
         print!("uid\t{:s}\ngroups\t", pw_name);
         group(possible_pw, true);
     } else {
-        let login = unsafe { from_c_str(getlogin()) };
+        let login = unsafe { from_c_str(getlogin() as *const i8) };
         let rid = unsafe { getuid() };
         let pw = unsafe { getpwuid(rid) };
 
@@ -308,7 +308,7 @@ fn auditid() { }
 #[cfg(not(target_os = "linux"))]
 fn auditid() {
     let auditinfo: audit::c_auditinfo_addr_t = unsafe { audit::uninitialized() };
-    let address = &auditinfo as *audit::c_auditinfo_addr_t;
+    let address = &auditinfo as *mut audit::c_auditinfo_addr_t;
     if  unsafe { audit::getaudit(address) } < 0 {
         println!("couldn't retrieve information");
         return;
diff --git a/logname/logname.rs b/logname/logname.rs
index eb5e5abc0..4f32aa5ea 100644
--- a/logname/logname.rs
+++ b/logname/logname.rs
@@ -26,11 +26,11 @@ use libc::c_char;
 
 extern {
     // POSIX requires using getlogin (or equivalent code)
-    pub fn getlogin() -> *libc::c_char;
+    pub fn getlogin() -> *const libc::c_char;
 }
 
 unsafe fn get_userlogin() -> String {
-    let login: *libc::c_char = getlogin();
+    let login: *const libc::c_char = getlogin();
 
     str::raw::from_c_str(login)
 }
diff --git a/nohup/nohup.rs b/nohup/nohup.rs
index 492503eee..87d48f90f 100644
--- a/nohup/nohup.rs
+++ b/nohup/nohup.rs
@@ -30,7 +30,7 @@ static VERSION: &'static str = "1.0.0";
 
 #[cfg(target_os = "macos")]
 extern {
-    fn _vprocmgr_detach_from_console(flags: u32) -> *libc::c_int;
+    fn _vprocmgr_detach_from_console(flags: u32) -> *const libc::c_int;
 }
 
 #[cfg(target_os = "macos")]
@@ -43,7 +43,7 @@ fn rewind_stdout<T: std::rt::rtio::RtioFileStream>(s: &mut T) {
 
 #[cfg(target_os = "linux")]
 #[cfg(target_os = "freebsd")]
-fn _vprocmgr_detach_from_console(_: u32) -> *libc::c_int { std::ptr::null() }
+fn _vprocmgr_detach_from_console(_: u32) -> *const libc::c_int { std::ptr::null() }
 
 #[cfg(target_os = "linux")]
 #[cfg(target_os = "freebsd")]
@@ -83,9 +83,9 @@ pub fn uumain(args: Vec<String>) -> int {
     unsafe {
         // we ignore the memory leak here because it doesn't matter anymore
         let executable = opts.free.get(0).as_slice().to_c_str().unwrap();
-        let mut args: Vec<*i8> = opts.free.iter().map(|x| x.to_c_str().unwrap()).collect();
+        let mut args: Vec<*const i8> = opts.free.iter().map(|x| x.to_c_str().unwrap()).collect();
         args.push(std::ptr::null());
-        execvp(executable as *libc::c_char, args.as_ptr() as **libc::c_char) as int
+        execvp(executable as *const libc::c_char, args.as_ptr() as *mut *const libc::c_char) as int
     }
 }
 
diff --git a/realpath/realpath.rs b/realpath/realpath.rs
index a8b89401a..a17302fa5 100644
--- a/realpath/realpath.rs
+++ b/realpath/realpath.rs
@@ -78,7 +78,7 @@ fn resolve_path(path: &str, strip: bool, zero: bool, quiet: bool) -> bool {
         Some(x) => x,
     };
 
-    let mut links_left = 256;
+    let mut links_left = 256i;
 
     for part in abs.components() {
         result.push(part);
diff --git a/seq/seq.rs b/seq/seq.rs
index 188b44fd2..994db7b82 100644
--- a/seq/seq.rs
+++ b/seq/seq.rs
@@ -85,7 +85,7 @@ fn parse_options(args: Vec<String>, options: &mut SeqOptions) -> Result<Vec<Stri
                 },
                 _ => {
                     if arg.len() > 1 && arg.as_slice().char_at(0) == '-' {
-                        let argptr: *String = &arg;  // escape from the borrow checker
+                        let argptr: *const String = &arg;  // escape from the borrow checker
                         let mut chiter = unsafe { (*argptr).as_slice() }.chars().skip(1);
                         let mut ch = ' ';
                         while match chiter.next() { Some(m) => { ch = m; true } None => false } {
diff --git a/sync/sync.rs b/sync/sync.rs
index 7533bebe3..15b1ad809 100644
--- a/sync/sync.rs
+++ b/sync/sync.rs
@@ -16,6 +16,7 @@ extern crate getopts;
 extern crate libc;
 
 use getopts::{optflag, getopts, usage};
+#[cfg(windows)]use std::ptr::null;
 
 #[path = "../common/util.rs"] mod util;
 
@@ -39,22 +40,22 @@ mod platform {
     use std::{mem, str};
 
     extern "system" {
-        fn CreateFileA(lpFileName: *libc::c_char,
+        fn CreateFileA(lpFileName: *const libc::c_char,
                       dwDesiredAccess: libc::uint32_t,
                       dwShareMode: libc::uint32_t,
-                      lpSecurityAttributes: *libc::c_void, // *LPSECURITY_ATTRIBUTES
+                      lpSecurityAttributes: *const libc::c_void, // *LPSECURITY_ATTRIBUTES
                       dwCreationDisposition: libc::uint32_t,
                       dwFlagsAndAttributes: libc::uint32_t,
-                      hTemplateFile: *libc::c_void) -> *libc::c_void;
-        fn GetDriveTypeA(lpRootPathName: *libc::c_char) -> libc::c_uint;
+                      hTemplateFile: *const libc::c_void) -> *const libc::c_void;
+        fn GetDriveTypeA(lpRootPathName: *const libc::c_char) -> libc::c_uint;
         fn GetLastError() -> libc::uint32_t;
-        fn FindFirstVolumeA(lpszVolumeName: *libc::c_char,
-                            cchBufferLength: libc::uint32_t) -> *libc::c_void;
-        fn FindNextVolumeA(hFindVolume: *libc::c_void,
-                           lpszVolumeName: *libc::c_char,
+        fn FindFirstVolumeA(lpszVolumeName: *mut libc::c_char,
+                            cchBufferLength: libc::uint32_t) -> *const libc::c_void;
+        fn FindNextVolumeA(hFindVolume: *const libc::c_void,
+                           lpszVolumeName: *mut libc::c_char,
                            cchBufferLength: libc::uint32_t) -> libc::c_int;
-        fn FindVolumeClose(hFindVolume: *libc::c_void) -> libc::c_int;
-        fn FlushFileBuffers(hFile: *libc::c_void) -> libc::c_int;
+        fn FindVolumeClose(hFindVolume: *const libc::c_void) -> libc::c_int;
+        fn FlushFileBuffers(hFile: *const libc::c_void) -> libc::c_int;
     }
 
     #[allow(unused_unsafe)]
@@ -66,11 +67,11 @@ mod platform {
                     match CreateFileA(sliced_name_buffer,
                                       0xC0000000, // GENERIC_WRITE
                                       0x00000003, // FILE_SHARE_WRITE,
-                                      0 as *libc::c_void,
+                                      null(),
                                       0x00000003, // OPEN_EXISTING
                                       0,
-                                      0 as *libc::c_void) {
-                        _x if _x == -1 as *libc::c_void => { // INVALID_HANDLE_VALUE
+                                      null()) {
+                        _x if _x == -1 as *const libc::c_void => { // INVALID_HANDLE_VALUE
                             crash!(GetLastError(), "failed to create volume handle");
                         }
                         handle @ _ => {
@@ -85,10 +86,10 @@ mod platform {
     }
 
     #[allow(unused_unsafe)]
-    unsafe fn find_first_volume() -> (String, *libc::c_void) {
+    unsafe fn find_first_volume() -> (String, *const libc::c_void) {
         let name: [libc::c_char, ..260] = mem::uninitialized(); // MAX_PATH
         match FindFirstVolumeA(name.as_ptr(), name.len() as libc::uint32_t) {
-            _x if _x == -1 as *libc::c_void => { // INVALID_HANDLE_VALUE
+            _x if _x == -1 as *const libc::c_void => { // INVALID_HANDLE_VALUE
                 crash!(GetLastError(), "failed to find first volume");
             }
             handle @ _ => {
diff --git a/tty/tty.rs b/tty/tty.rs
index a74662913..c664e471b 100644
--- a/tty/tty.rs
+++ b/tty/tty.rs
@@ -28,7 +28,7 @@ use getopts::{optflag,getopts};
 mod util;
 
 extern {
-    fn ttyname(filedesc: libc::c_int) -> *libc::c_char;
+    fn ttyname(filedesc: libc::c_int) -> *const libc::c_char;
     fn isatty(filedesc: libc::c_int) -> libc::c_int;
 }
 
diff --git a/uptime/uptime.rs b/uptime/uptime.rs
index 796eee351..e21f068a2 100644
--- a/uptime/uptime.rs
+++ b/uptime/uptime.rs
@@ -19,7 +19,7 @@ extern crate libc;
 
 use std::mem::transmute;
 use std::io::{print, File};
-use std::ptr::null;
+use std::ptr::{mut_null, null};
 use std::from_str::from_str;
 use libc::{time_t, c_double, c_int, c_char};
 use c_types::c_tm;
@@ -34,16 +34,16 @@ use utmpx::*;
 static NAME: &'static str = "uptime";
 
 extern {
-    fn time(timep: *time_t) -> time_t;
-    fn localtime(timep: *time_t) -> *c_tm;
+    fn time(timep: *mut time_t) -> time_t;
+    fn localtime(timep: *const time_t) -> *const c_tm;
 
-    fn getloadavg(loadavg: *c_double, nelem: c_int) -> c_int;
+    fn getloadavg(loadavg: *mut c_double, nelem: c_int) -> c_int;
 
-    fn getutxent() -> *c_utmp;
+    fn getutxent() -> *const c_utmp;
     fn setutxent();
     fn endutxent();
 
-    fn utmpxname(file: *c_char) -> c_int;
+    fn utmpxname(file: *const c_char) -> c_int;
 }
 
 pub fn uumain(args: Vec<String>) -> int {
@@ -81,8 +81,8 @@ pub fn uumain(args: Vec<String>) -> int {
 }
 
 fn print_loadavg() {
-    let avg: [c_double, ..3] = [0.0, ..3];
-    let loads: i32 = unsafe { transmute(getloadavg(avg.as_ptr(), 3)) };
+    let mut avg: [c_double, ..3] = [0.0, ..3];
+    let loads: i32 = unsafe { transmute(getloadavg(avg.as_mut_ptr(), 3)) };
 
     if loads == -1 {
         print!("\n");
@@ -143,7 +143,7 @@ fn print_nusers(nusers: uint) {
 }
 
 fn print_time() {
-    let local_time = unsafe { *localtime(&time(null())) };
+    let local_time = unsafe { *localtime(&time(mut_null())) };
 
     if local_time.tm_hour >= 0 && local_time.tm_min >= 0 &&
        local_time.tm_sec >= 0 {
@@ -160,7 +160,7 @@ fn get_uptime(boot_time: Option<time_t>) -> i64 {
         Ok(s) => s,
         _ => return match boot_time {
                 Some(t) => {
-                    let now = unsafe { time(null()) };
+                    let now = unsafe { time(mut_null()) };
                     ((now - t) * 100) as i64 // Return in ms
                 },
                 _ => -1
diff --git a/users/users.rs b/users/users.rs
index e359c3eb3..69a4f2194 100644
--- a/users/users.rs
+++ b/users/users.rs
@@ -32,16 +32,16 @@ mod util;
 mod utmpx;
 
 extern {
-    fn getutxent() -> *c_utmp;
-    fn getutxid(ut: *c_utmp) -> *c_utmp;
-    fn getutxline(ut: *c_utmp) -> *c_utmp;
+    fn getutxent() -> *const c_utmp;
+    fn getutxid(ut: *const c_utmp) -> *const c_utmp;
+    fn getutxline(ut: *const c_utmp) -> *const c_utmp;
 
-    fn pututxline(ut: *c_utmp) -> *c_utmp;
+    fn pututxline(ut: *const c_utmp) -> *const c_utmp;
 
     fn setutxent();
     fn endutxent();
 
-    fn utmpxname(file: *libc::c_char) -> libc::c_int;
+    fn utmpxname(file: *const libc::c_char) -> libc::c_int;
 }
 
 static NAME: &'static str = "users";
diff --git a/whoami/whoami.rs b/whoami/whoami.rs
index ad3080263..ea56b9da8 100644
--- a/whoami/whoami.rs
+++ b/whoami/whoami.rs
@@ -35,9 +35,9 @@ mod platform {
     }
 
     pub unsafe fn getusername() -> String {
-        let passwd: *c_passwd = getpwuid(geteuid());
+        let passwd: *const c_passwd = getpwuid(geteuid());
 
-        let pw_name: *libc::c_char = (*passwd).pw_name;
+        let pw_name: *const libc::c_char = (*passwd).pw_name;
         let name = str::raw::from_c_str(pw_name);
 
         name
@@ -51,7 +51,7 @@ mod platform {
     use std::str;
 
     extern "system" {
-        pub fn GetUserNameA(out: *libc::c_char, len: *libc::uint32_t) -> libc::uint8_t;
+        pub fn GetUserNameA(out: *mut libc::c_char, len: *mut libc::uint32_t) -> libc::uint8_t;
     }
 
     #[allow(unused_unsafe)]