diff --git a/src/unix/uclibc/mod.rs b/src/unix/uclibc/mod.rs
index 076ee41d0403e..9345573ebe3c7 100644
--- a/src/unix/uclibc/mod.rs
+++ b/src/unix/uclibc/mod.rs
@@ -11,7 +11,7 @@ pub type id_t = ::c_uint;
 pub type useconds_t = u32;
 pub type dev_t = u64;
 pub type socklen_t = u32;
-pub type pthread_t = c_ulong;
+pub type pthread_t = ::c_ulong;
 pub type mode_t = u32;
 pub type ino64_t = u64;
 pub type off64_t = i64;
diff --git a/src/unix/uclibc/x86_64/mod.rs b/src/unix/uclibc/x86_64/mod.rs
new file mode 100644
index 0000000000000..27222013479c4
--- /dev/null
+++ b/src/unix/uclibc/x86_64/mod.rs
@@ -0,0 +1,312 @@
+//! Definitions for l4re-uclibc on 64bit systems
+
+pub type blkcnt_t = i64;
+pub type blksize_t = i64;
+pub type c_char = u8;
+pub type c_long = i64;
+pub type c_ulong = u64;
+pub type fsblkcnt_t = ::c_ulong;
+pub type fsfilcnt_t = ::c_ulong;
+pub type fsword_t = ::c_long;
+pub type ino_t = ::c_ulong;
+pub type nlink_t = ::c_uint;
+pub type off_t = ::c_long;
+pub type rlim_t = c_ulong;
+pub type rlim64_t = u64;
+pub type suseconds_t = ::c_long;
+pub type time_t = ::c_int;
+pub type wchar_t = ::c_int;
+
+// ToDo, used?
+//pub type d_ino = ::c_ulong;
+pub type nfds_t = ::c_ulong;
+
+s! {
+    // ------------------------------------------------------------
+    // networking
+    pub struct in_addr {
+        pub s_addr: in_addr_t,
+    }
+
+    pub struct in6_addr {
+        pub s6_addr: [u8; 16],
+        __align: [u32; 0],
+    }
+
+    pub struct sockaddr {
+        pub sa_family: sa_family_t,
+        pub sa_data: [::c_char; 14],
+    }
+
+    pub struct sockaddr_in {
+        pub sin_family: sa_family_t,
+        pub sin_port: ::in_port_t,
+        pub sin_addr: ::in_addr,
+        pub sin_zero: [u8; 8],
+    }
+
+    pub struct sockaddr_in6 {
+        pub sin6_family: sa_family_t,
+        pub sin6_port: in_port_t,
+        pub sin6_flowinfo: u32,
+        pub sin6_addr: ::in6_addr,
+        pub sin6_scope_id: u32,
+    }
+
+    // ------------------------------------------------------------
+    // definitions below are *unverified* and might **break** the software
+    pub struct stat { // ToDo
+        pub st_dev: ::c_ulong,
+        st_pad1: [::c_long; 2],
+        pub st_ino: ::ino_t,
+        pub st_mode: ::mode_t,
+        pub st_nlink: ::nlink_t,
+        pub st_uid: ::uid_t,
+        pub st_gid: ::gid_t,
+        pub st_rdev: u64,
+        pub st_pad2: [u64; 1],
+        pub st_size: off_t,
+        st_pad3: ::c_long,
+        pub st_atime: ::time_t,
+        pub st_atime_nsec: ::c_long,
+        pub st_mtime: ::time_t,
+        pub st_mtime_nsec: ::c_long,
+        pub st_ctime: ::time_t,
+        pub st_ctime_nsec: ::c_long,
+        pub st_blksize: ::blksize_t,
+        st_pad4: ::c_long,
+        pub st_blocks: ::blkcnt_t,
+        st_pad5: [::c_long; 7],
+    }
+
+    pub struct statvfs { // ToDo: broken
+        pub f_bsize: ::c_ulong,
+        pub f_frsize: ::c_ulong,
+        pub f_blocks: ::fsblkcnt_t,
+        pub f_bfree: ::fsblkcnt_t,
+        pub f_bavail: ::fsblkcnt_t,
+        pub f_files: ::fsfilcnt_t,
+        pub f_ffree: ::fsfilcnt_t,
+        pub f_favail: ::fsfilcnt_t,
+        #[cfg(target_endian = "little")]
+        pub f_fsid: ::c_ulong,
+        #[cfg(target_pointer_width = "32")]
+        __f_unused: ::c_int,
+        #[cfg(target_endian = "big")]
+        pub f_fsid: ::c_ulong,
+        pub f_flag: ::c_ulong,
+        pub f_namemax: ::c_ulong,
+        __f_spare: [::c_int; 6],
+    }
+
+    pub struct dirent { // Todo
+        pub d_ino: ino_64_t,
+        pub d_off: off64_t,
+        d_reclen: u16,
+        pub d_type: u8,
+        pub d_name: [i8; 256],
+    }
+
+    pub struct dirent64 { //
+        pub d_ino: ino64_t,
+        pub d_off: off64_t,
+        pub d_reclen: u16,
+        pub d_type: u8,
+        pub d_name: [i8; 256],
+    }
+
+    pub struct pthread_attr_t { // ToDo
+        __size: [u64; 7]
+    }
+
+    pub struct sigaction { // TODO!!
+        pub sa_sigaction: ::sighandler_t,
+        pub sa_mask: ::sigset_t,
+        #[cfg(target_arch = "sparc64")]
+        __reserved0: ::c_int,
+        pub sa_flags: ::c_int,
+        _restorer: *mut ::c_void,
+    }
+
+    pub struct stack_t { // ToDo
+        pub ss_sp: *mut ::c_void,
+        pub ss_flags: ::c_int,
+        pub ss_size: ::size_t
+    }
+
+    pub struct statfs { // ToDo
+        pub f_type: fsword_t,
+        pub f_bsize: fsword_t,
+        pub f_blocks: ::fsblkcnt_t,
+        pub f_bfree: ::fsblkcnt_t,
+        pub f_bavail: ::fsblkcnt_t,
+        pub f_files: ::fsfilcnt_t,
+        pub f_ffree: ::fsfilcnt_t,
+        pub f_fsid: ::fsid_t,
+        pub f_namelen: fsword_t,
+        pub f_frsize: fsword_t,
+        f_spare: [fsword_t; 5],
+    }
+
+    pub struct msghdr { // ToDo
+        pub msg_name: *mut ::c_void,
+        pub msg_namelen: ::socklen_t,
+        pub msg_iov: *mut ::iovec,
+        pub msg_iovlen: ::size_t,
+        pub msg_control: *mut ::c_void,
+        pub msg_controllen: ::size_t,
+        pub msg_flags: ::c_int,
+    }
+
+    pub struct termios { // ToDo
+        pub c_iflag: ::tcflag_t,
+        pub c_oflag: ::tcflag_t,
+        pub c_cflag: ::tcflag_t,
+        pub c_lflag: ::tcflag_t,
+        pub c_line: ::cc_t,
+        pub c_cc: [::cc_t; ::NCCS],
+    }
+
+    pub struct sem_t { // ToDo
+        #[cfg(target_pointer_width = "32")]
+        __size: [::c_char; 16],
+        #[cfg(target_pointer_width = "64")]
+        __size: [::c_char; 32],
+        __align: [::c_long; 0],
+    }
+
+    pub struct pthread_mutex_t { // ToDo
+        #[cfg(any(target_arch = "mips", target_arch = "arm",
+                  target_arch = "powerpc"))]
+        __align: [::c_long; 0],
+        #[cfg(not(any(target_arch = "mips", target_arch = "arm",
+                      target_arch = "powerpc")))]
+        __align: [::c_longlong; 0],
+        size: [u8; __SIZEOF_PTHREAD_MUTEX_T],
+    }
+
+    pub struct pthread_mutexattr_t { // ToDo
+        #[cfg(any(target_arch = "x86_64", target_arch = "powerpc64",
+                  target_arch = "mips64", target_arch = "s390x",
+                  target_arch = "sparc64"))]
+        __align: [::c_int; 0],
+        #[cfg(not(any(target_arch = "x86_64", target_arch = "powerpc64",
+                      target_arch = "mips64", target_arch = "s390x",
+                      target_arch = "sparc64")))]
+        __align: [::c_long; 0],
+        size: [u8; __SIZEOF_PTHREAD_MUTEXATTR_T],
+    }
+
+    pub struct pthread_cond_t { // ToDo
+        __align: [::c_longlong; 0],
+        size: [u8; __SIZEOF_PTHREAD_COND_T],
+    }
+
+    pub struct pthread_condattr_t { // ToDo
+        __align: [::c_int; 0],
+        size: [u8; __SIZEOF_PTHREAD_CONDATTR_T],
+    }
+
+    pub struct pthread_rwlock_t { // ToDo
+        #[cfg(any(target_arch = "mips", target_arch = "arm",
+                  target_arch = "powerpc"))]
+        __align: [::c_long; 0],
+        #[cfg(not(any(target_arch = "mips", target_arch = "arm",
+                      target_arch = "powerpc")))]
+        __align: [::c_longlong; 0],
+        size: [u8; __SIZEOF_PTHREAD_RWLOCK_T],
+    }
+
+    pub struct sigset_t { // ToDo
+        __val: [::c_ulong; 16],
+    }
+
+    pub struct sysinfo { // ToDo
+        pub uptime: ::c_long,
+        pub loads: [::c_ulong; 3],
+        pub totalram: ::c_ulong,
+        pub freeram: ::c_ulong,
+        pub sharedram: ::c_ulong,
+        pub bufferram: ::c_ulong,
+        pub totalswap: ::c_ulong,
+        pub freeswap: ::c_ulong,
+        pub procs: ::c_ushort,
+        pub pad: ::c_ushort,
+        pub totalhigh: ::c_ulong,
+        pub freehigh: ::c_ulong,
+        pub mem_unit: ::c_uint,
+        pub _f: [::c_char; 0],
+    }
+
+    pub struct glob_t { // ToDo
+        pub gl_pathc: ::size_t,
+        pub gl_pathv: *mut *mut c_char,
+        pub gl_offs: ::size_t,
+        pub gl_flags: ::c_int,
+        __unused1: *mut ::c_void,
+        __unused2: *mut ::c_void,
+        __unused3: *mut ::c_void,
+        __unused4: *mut ::c_void,
+        __unused5: *mut ::c_void,
+    }
+
+    pub struct stat64 { // ToDo
+        pub st_dev: ::dev_t,
+        pub st_ino: ::ino64_t,
+        pub st_nlink: ::nlink_t,
+        pub st_mode: ::mode_t,
+        pub st_uid: ::uid_t,
+        pub st_gid: ::gid_t,
+        __pad0: ::c_int,
+        pub st_rdev: ::dev_t,
+        pub st_size: ::off_t,
+        pub st_blksize: ::blksize_t,
+        pub st_blocks: ::blkcnt64_t,
+        pub st_atime: ::time_t,
+        pub st_atime_nsec: ::c_long,
+        pub st_mtime: ::time_t,
+        pub st_mtime_nsec: ::c_long,
+        pub st_ctime: ::time_t,
+        pub st_ctime_nsec: ::c_long,
+        __reserved: [::c_long; 3],
+    }
+
+    pub struct rlimit64 { // ToDo
+        pub rlim_cur: rlim64_t,
+        pub rlim_max: rlim64_t,
+    }
+
+    pub struct cpu_set_t { // ToDo
+        #[cfg(target_pointer_width = "32")]
+        bits: [u32; 32],
+        #[cfg(target_pointer_width = "64")]
+        bits: [u64; 16],
+    }
+
+    pub struct timespec { // ToDo
+        tv_sec: time_t, // seconds
+        tv_nsec: ::c_ulong, // nanoseconds
+    }
+
+    pub struct fsid_t { // ToDo
+        __val: [::c_int; 2],
+    }
+}
+
+// constants
+pub const O_CLOEXEC: ::c_int = 0x80000;
+pub const O_DIRECTORY: ::c_int = 0200000;
+pub const NCCS: usize = 32;
+pub const __SIZEOF_PTHREAD_MUTEX_T: usize = 40;
+pub const __SIZEOF_PTHREAD_MUTEXATTR_T: usize = 4;
+pub const PTHREAD_MUTEX_NORMAL: ::c_int = 0;
+pub const PTHREAD_MUTEX_RECURSIVE: ::c_int = 1;
+pub const PTHREAD_MUTEX_ERRORCHECK: ::c_int = 2;
+pub const PTHREAD_MUTEX_DEFAULT: ::c_int = PTHREAD_MUTEX_NORMAL;
+pub const __SIZEOF_PTHREAD_COND_T: usize = 48;
+pub const __SIZEOF_PTHREAD_CONDATTR_T: usize = 4;
+pub const __SIZEOF_PTHREAD_RWLOCK_T: usize = 56;
+
+extern {
+    pub fn memalign(align: ::size_t, size: ::size_t) -> *mut ::c_void;
+}