diff --git a/src/lib.rs b/src/lib.rs
index 4a586f6..2e7e5b1 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -96,6 +96,11 @@ pub mod platform;
 #[path="platform/freebsd-x86_64/mod.rs"]
 pub mod platform;
 
+#[cfg(all(target_os = "netbsd",
+          target_arch = "x86_64"))]
+#[path="platform/netbsd-x86_64/mod.rs"]
+pub mod platform;
+
 #[cfg(all(target_os = "macos",
           target_arch = "x86_64"))]
 #[path="platform/macos-x86_64/mod.rs"]
diff --git a/src/platform/netbsd-x86_64/mod.rs b/src/platform/netbsd-x86_64/mod.rs
new file mode 100644
index 0000000..44f955c
--- /dev/null
+++ b/src/platform/netbsd-x86_64/mod.rs
@@ -0,0 +1,137 @@
+// Copyright 2014 The syscall.rs Project Developers. See the
+// COPYRIGHT file at the top-level directory of this distribution.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! This library was built for x86-64 FreeBSD.
+
+use core::arch::asm;
+
+pub mod nr;
+
+#[inline(always)]
+pub unsafe fn syscall0(mut n: usize) -> usize {
+    asm!(
+        "syscall",
+        inout("rax") n,
+        out("rcx") _,
+        out("r11") _,
+        options(nostack),
+    );
+    n
+}
+
+#[inline(always)]
+pub unsafe fn syscall1(mut n: usize, a1: usize) -> usize {
+    asm!(
+        "syscall",
+        inout("rax") n,
+        in("rdi") a1,
+        out("rcx") _,
+        out("r11") _,
+        options(nostack),
+    );
+    n
+}
+
+#[inline(always)]
+pub unsafe fn syscall2(mut n: usize, a1: usize, a2: usize) -> usize {
+    asm!(
+        "syscall",
+        inout("rax") n,
+        in("rdi") a1,
+        in("rsi") a2,
+        out("rcx") _,
+        out("r11") _,
+        options(nostack),
+    );
+    n
+}
+
+#[inline(always)]
+pub unsafe fn syscall3(mut n: usize, a1: usize, a2: usize, a3: usize) -> usize {
+    asm!(
+        "syscall",
+        inout("rax") n,
+        in("rdi") a1,
+        in("rsi") a2,
+        in("rdx") a3,
+        out("rcx") _,
+        out("r11") _,
+        options(nostack),
+    );
+    n
+}
+
+#[inline(always)]
+pub unsafe fn syscall4(mut n: usize,
+                       a1: usize,
+                       a2: usize,
+                       a3: usize,
+                       a4: usize)
+                       -> usize {
+    asm!(
+        "syscall",
+        inout("rax") n,
+        in("rdi") a1,
+        in("rsi") a2,
+        in("rdx") a3,
+        in("r10") a4,
+        out("rcx") _,
+        out("r11") _,
+        options(nostack),
+    );
+    n
+}
+
+#[inline(always)]
+pub unsafe fn syscall5(mut n: usize,
+                       a1: usize,
+                       a2: usize,
+                       a3: usize,
+                       a4: usize,
+                       a5: usize)
+                       -> usize {
+    asm!(
+        "syscall",
+        inout("rax") n,
+        in("rdi") a1,
+        in("rsi") a2,
+        in("rdx") a3,
+        in("r10") a4,
+        in("r8") a5,
+        out("rcx") _,
+        out("r11") _,
+        options(nostack),
+    );
+    n
+}
+
+#[inline(always)]
+pub unsafe fn syscall6(mut n: usize,
+                       a1: usize,
+                       a2: usize,
+                       a3: usize,
+                       a4: usize,
+                       a5: usize,
+                       a6: usize)
+                       -> usize {
+    asm!(
+        "syscall",
+        inout("rax") n,
+        in("rdi") a1,
+        in("rsi") a2,
+        in("rdx") a3,
+        in("r10") a4,
+        in("r8") a5,
+        in("r9") a6,
+        out("rcx") _,
+        out("r11") _,
+        options(nostack),
+    );
+    n
+}
diff --git a/src/platform/netbsd-x86_64/nr.rs b/src/platform/netbsd-x86_64/nr.rs
new file mode 100644
index 0000000..f2101fe
--- /dev/null
+++ b/src/platform/netbsd-x86_64/nr.rs
@@ -0,0 +1,440 @@
+// Copyright 2014 The syscall.rs Project Developers. See the
+// COPYRIGHT file at the top-level directory of this distribution.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! System call numbers for x86-64 NetBSD.
+
+pub const SYSCALL: usize = 0;
+pub const EXIT: usize = 1;
+pub const FORK: usize = 2;
+pub const READ: usize = 3;
+pub const WRITE: usize = 4;
+pub const OPEN: usize = 5;
+pub const CLOSE: usize = 6;
+pub const COMPAT_50_WAIT4: usize = 7;
+pub const COMPAT_43_OCREAT: usize = 8;
+pub const LINK: usize = 9;
+pub const UNLINK: usize = 10;
+pub const CHDIR: usize = 12;
+pub const FCHDIR: usize = 13;
+pub const COMPAT_50_MKNOD: usize = 14;
+pub const CHMOD: usize = 15;
+pub const CHOWN: usize = 16;
+pub const BREAK: usize = 17;
+pub const COMPAT_20_GETFSSTAT: usize = 18;
+pub const COMPAT_43_OLSEEK: usize = 19;
+pub const GETPID: usize = 20;
+pub const COMPAT_40_MOUNT: usize = 21;
+pub const UNMOUNT: usize = 22;
+pub const SETUID: usize = 23;
+pub const GETUID: usize = 24;
+pub const GETEUID: usize = 25;
+pub const PTRACE: usize = 26;
+pub const RECVMSG: usize = 27;
+pub const SENDMSG: usize = 28;
+pub const RECVFROM: usize = 29;
+pub const ACCEPT: usize = 30;
+pub const GETPEERNAME: usize = 31;
+pub const GETSOCKNAME: usize = 32;
+pub const ACCESS: usize = 33;
+pub const CHFLAGS: usize = 34;
+pub const FCHFLAGS: usize = 35;
+pub const SYNC: usize = 36;
+pub const KILL: usize = 37;
+pub const COMPAT_43_STAT43: usize = 38;
+pub const GETPPID: usize = 39;
+pub const COMPAT_43_LSTAT43: usize = 40;
+pub const DUP: usize = 41;
+pub const PIPE: usize = 42;
+pub const GETEGID: usize = 43;
+pub const PROFIL: usize = 44;
+pub const KTRACE: usize = 45;
+pub const COMPAT_13_SIGACTION13: usize = 46;
+pub const GETGID: usize = 47;
+pub const COMPAT_13_SIGPROCMASK13: usize = 48;
+pub const __GETLOGIN: usize = 49;
+pub const __SETLOGIN: usize = 50;
+pub const ACCT: usize = 51;
+pub const COMPAT_13_SIGPENDING13: usize = 52;
+pub const COMPAT_13_SIGALTSTACK13: usize = 53;
+pub const IOCTL: usize = 54;
+pub const COMPAT_12_OREBOOT: usize = 55;
+pub const REVOKE: usize = 56;
+pub const SYMLINK: usize = 57;
+pub const READLINK: usize = 58;
+pub const EXECVE: usize = 59;
+pub const UMASK: usize = 60;
+pub const CHROOT: usize = 61;
+pub const COMPAT_43_FSTAT43: usize = 62;
+pub const COMPAT_43_OGETKERNINFO: usize = 63;
+pub const COMPAT_43_OGETPAGESIZE: usize = 64;
+pub const COMPAT_12_MSYNC: usize = 65;
+pub const VFORK: usize = 66;
+pub const COMPAT_43_OMMAP: usize = 71;
+pub const VADVISE: usize = 72;
+pub const MUNMAP: usize = 73;
+pub const MPROTECT: usize = 74;
+pub const MADVISE: usize = 75;
+pub const MINCORE: usize = 78;
+pub const GETGROUPS: usize = 79;
+pub const SETGROUPS: usize = 80;
+pub const GETPGRP: usize = 81;
+pub const SETPGID: usize = 82;
+pub const COMPAT_50_SETITIMER: usize = 83;
+pub const COMPAT_43_OWAIT: usize = 84;
+pub const COMPAT_12_OSWAPON: usize = 85;
+pub const COMPAT_50_GETITIMER: usize = 86;
+pub const COMPAT_43_OGETHOSTNAME: usize = 87;
+pub const COMPAT_43_OSETHOSTNAME: usize = 88;
+pub const COMPAT_43_OGETDTABLESIZE: usize = 89;
+pub const DUP2: usize = 90;
+pub const FCNTL: usize = 92;
+pub const COMPAT_50_SELECT: usize = 93;
+pub const FSYNC: usize = 95;
+pub const SETPRIORITY: usize = 96;
+pub const COMPAT_30_SOCKET: usize = 97;
+pub const CONNECT: usize = 98;
+pub const COMPAT_43_OACCEPT: usize = 99;
+pub const GETPRIORITY: usize = 100;
+pub const COMPAT_43_OSEND: usize = 101;
+pub const COMPAT_43_ORECV: usize = 102;
+pub const COMPAT_13_SIGRETURN13: usize = 103;
+pub const BIND: usize = 104;
+pub const SETSOCKOPT: usize = 105;
+pub const LISTEN: usize = 106;
+pub const COMPAT_43_OSIGVEC: usize = 108;
+pub const COMPAT_43_OSIGBLOCK: usize = 109;
+pub const COMPAT_43_OSIGSETMASK: usize = 110;
+pub const COMPAT_13_SIGSUSPEND13: usize = 111;
+pub const COMPAT_43_OSIGSTACK: usize = 112;
+pub const COMPAT_43_ORECVMSG: usize = 113;
+pub const COMPAT_43_OSENDMSG: usize = 114;
+pub const COMPAT_50_GETTIMEOFDAY: usize = 116;
+pub const COMPAT_50_GETRUSAGE: usize = 117;
+pub const GETSOCKOPT: usize = 118;
+pub const READV: usize = 120;
+pub const WRITEV: usize = 121;
+pub const COMPAT_50_SETTIMEOFDAY: usize = 122;
+pub const FCHOWN: usize = 123;
+pub const FCHMOD: usize = 124;
+pub const COMPAT_43_ORECVFROM: usize = 125;
+pub const SETREUID: usize = 126;
+pub const SETREGID: usize = 127;
+pub const RENAME: usize = 128;
+pub const COMPAT_43_OTRUNCATE: usize = 129;
+pub const COMPAT_43_OFTRUNCATE: usize = 130;
+pub const FLOCK: usize = 131;
+pub const MKFIFO: usize = 132;
+pub const SENDTO: usize = 133;
+pub const SHUTDOWN: usize = 134;
+pub const SOCKETPAIR: usize = 135;
+pub const MKDIR: usize = 136;
+pub const RMDIR: usize = 137;
+pub const COMPAT_50_UTIMES: usize = 138;
+pub const COMPAT_50_ADJTIME: usize = 140;
+pub const COMPAT_43_OGETPEERNAME: usize = 141;
+pub const COMPAT_43_OGETHOSTID: usize = 142;
+pub const COMPAT_43_OSETHOSTID: usize = 143;
+pub const COMPAT_43_OGETRLIMIT: usize = 144;
+pub const COMPAT_43_OSETRLIMIT: usize = 145;
+pub const COMPAT_43_OKILLPG: usize = 146;
+pub const SETSID: usize = 147;
+pub const COMPAT_50_QUOTACTL: usize = 148;
+pub const COMPAT_43_OQUOTA: usize = 149;
+pub const COMPAT_43_OGETSOCKNAME: usize = 150;
+pub const NFSSVC: usize = 155;
+pub const COMPAT_43_OGETDIRENTRIES: usize = 156;
+pub const COMPAT_20_STATFS: usize = 157;
+pub const COMPAT_20_FSTATFS: usize = 158;
+pub const COMPAT_30_GETFH: usize = 161;
+pub const COMPAT_09_OGETDOMAINNAME: usize = 162;
+pub const COMPAT_09_OSETDOMAINNAME: usize = 163;
+pub const COMPAT_09_OUNAME: usize = 164;
+pub const SYSARCH: usize = 165;
+pub const COMPAT_10_OSEMSYS: usize = 169;
+pub const COMPAT_10_OMSGSYS: usize = 170;
+pub const COMPAT_10_OSHMSYS: usize = 171;
+pub const PREAD: usize = 173;
+pub const PWRITE: usize = 174;
+pub const COMPAT_30_NTP_GETTIME: usize = 175;
+pub const NTP_ADJTIME: usize = 176;
+pub const SETGID: usize = 181;
+pub const SETEGID: usize = 182;
+pub const SETEUID: usize = 183;
+pub const LFS_BMAPV: usize = 184;
+pub const LFS_MARKV: usize = 185;
+pub const LFS_SEGCLEAN: usize = 186;
+pub const COMPAT_50_LFS_SEGWAIT: usize = 187;
+pub const COMPAT_12_STAT12: usize = 188;
+pub const COMPAT_12_FSTAT12: usize = 189;
+pub const COMPAT_12_LSTAT12: usize = 190;
+pub const PATHCONF: usize = 191;
+pub const FPATHCONF: usize = 192;
+pub const GETSOCKOPT2: usize = 193;
+pub const GETRLIMIT: usize = 194;
+pub const SETRLIMIT: usize = 195;
+pub const COMPAT_12_GETDIRENTRIES: usize = 196;
+pub const MMAP: usize = 197;
+pub const __SYSCALL: usize = 198;
+pub const LSEEK: usize = 199;
+pub const TRUNCATE: usize = 200;
+pub const FTRUNCATE: usize = 201;
+pub const __SYSCTL: usize = 202;
+pub const MLOCK: usize = 203;
+pub const MUNLOCK: usize = 204;
+pub const UNDELETE: usize = 205;
+pub const COMPAT_50_FUTIMES: usize = 206;
+pub const GETPGID: usize = 207;
+pub const REBOOT: usize = 208;
+pub const POLL: usize = 209;
+pub const AFSSYS: usize = 210;
+pub const COMPAT_14___SEMCTL: usize = 220;
+pub const SEMGET: usize = 221;
+pub const SEMOP: usize = 222;
+pub const SEMCONFIG: usize = 223;
+pub const COMPAT_14_MSGCTL: usize = 224;
+pub const MSGGET: usize = 225;
+pub const MSGSND: usize = 226;
+pub const MSGRCV: usize = 227;
+pub const SHMAT: usize = 228;
+pub const COMPAT_14_SHMCTL: usize = 229;
+pub const SHMDT: usize = 230;
+pub const SHMGET: usize = 231;
+pub const COMPAT_50_CLOCK_GETTIME: usize = 232;
+pub const COMPAT_50_CLOCK_SETTIME: usize = 233;
+pub const COMPAT_50_CLOCK_GETRES: usize = 234;
+pub const TIMER_CREATE: usize = 235;
+pub const TIMER_DELETE: usize = 236;
+pub const COMPAT_50_TIMER_SETTIME: usize = 237;
+pub const COMPAT_50_TIMER_GETTIME: usize = 238;
+pub const TIMER_GETOVERRUN: usize = 239;
+pub const COMPAT_50_NANOSLEEP: usize = 240;
+pub const FDATASYNC: usize = 241;
+pub const MLOCKALL: usize = 242;
+pub const MUNLOCKALL: usize = 243;
+pub const COMPAT_50___SIGTIMEDWAIT: usize = 244;
+pub const SIGQUEUEINFO: usize = 245;
+pub const MODCTL: usize = 246;
+pub const _KSEM_INIT: usize = 247;
+pub const _KSEM_OPEN: usize = 248;
+pub const _KSEM_UNLINK: usize = 249;
+pub const _KSEM_CLOSE: usize = 250;
+pub const _KSEM_POST: usize = 251;
+pub const _KSEM_WAIT: usize = 252;
+pub const _KSEM_TRYWAIT: usize = 253;
+pub const _KSEM_GETVALUE: usize = 254;
+pub const _KSEM_DESTROY: usize = 255;
+pub const _KSEM_TIMEDWAIT: usize = 256;
+pub const MQ_OPEN: usize = 257;
+pub const MQ_CLOSE: usize = 258;
+pub const MQ_UNLINK: usize = 259;
+pub const MQ_GETATTR: usize = 260;
+pub const MQ_SETATTR: usize = 261;
+pub const MQ_NOTIFY: usize = 262;
+pub const MQ_SEND: usize = 263;
+pub const MQ_RECEIVE: usize = 264;
+pub const COMPAT_50_MQ_TIMEDSEND: usize = 265;
+pub const COMPAT_50_MQ_TIMEDRECEIVE: usize = 266;
+pub const __POSIX_RENAME: usize = 270;
+pub const SWAPCTL: usize = 271;
+pub const COMPAT_30_GETDENTS: usize = 272;
+pub const MINHERIT: usize = 273;
+pub const LCHMOD: usize = 274;
+pub const LCHOWN: usize = 275;
+pub const COMPAT_50_LUTIMES: usize = 276;
+pub const __MSYNC13: usize = 277;
+pub const COMPAT_30___STAT13: usize = 278;
+pub const COMPAT_30___FSTAT13: usize = 279;
+pub const COMPAT_30___LSTAT13: usize = 280;
+pub const __SIGALTSTACK14: usize = 281;
+pub const __VFORK14: usize = 282;
+pub const __POSIX_CHOWN: usize = 283;
+pub const __POSIX_FCHOWN: usize = 284;
+pub const __POSIX_LCHOWN: usize = 285;
+pub const GETSID: usize = 286;
+pub const __CLONE: usize = 287;
+pub const FKTRACE: usize = 288;
+pub const PREADV: usize = 289;
+pub const PWRITEV: usize = 290;
+pub const COMPAT_16___SIGACTION14: usize = 291;
+pub const __SIGPENDING14: usize = 292;
+pub const __SIGPROCMASK14: usize = 293;
+pub const __SIGSUSPEND14: usize = 294;
+pub const COMPAT_16___SIGRETURN14: usize = 295;
+pub const __GETCWD: usize = 296;
+pub const FCHROOT: usize = 297;
+pub const COMPAT_30_FHOPEN: usize = 298;
+pub const COMPAT_30_FHSTAT: usize = 299;
+pub const COMPAT_20_FHSTATFS: usize = 300;
+pub const COMPAT_50_____SEMCTL13: usize = 301;
+pub const COMPAT_50___MSGCTL13: usize = 302;
+pub const COMPAT_50___SHMCTL13: usize = 303;
+pub const LCHFLAGS: usize = 304;
+pub const ISSETUGID: usize = 305;
+pub const UTRACE: usize = 306;
+pub const GETCONTEXT: usize = 307;
+pub const SETCONTEXT: usize = 308;
+pub const _LWP_CREATE: usize = 309;
+pub const _LWP_EXIT: usize = 310;
+pub const _LWP_SELF: usize = 311;
+pub const _LWP_WAIT: usize = 312;
+pub const _LWP_SUSPEND: usize = 313;
+pub const _LWP_CONTINUE: usize = 314;
+pub const _LWP_WAKEUP: usize = 315;
+pub const _LWP_GETPRIVATE: usize = 316;
+pub const _LWP_SETPRIVATE: usize = 317;
+pub const _LWP_KILL: usize = 318;
+pub const _LWP_DETACH: usize = 319;
+pub const COMPAT_50__LWP_PARK: usize = 320;
+pub const _LWP_UNPARK: usize = 321;
+pub const _LWP_UNPARK_ALL: usize = 322;
+pub const _LWP_SETNAME: usize = 323;
+pub const _LWP_GETNAME: usize = 324;
+pub const _LWP_CTL: usize = 325;
+pub const COMPAT_60_SA_REGISTER: usize = 330;
+pub const COMPAT_60_SA_STACKS: usize = 331;
+pub const COMPAT_60_SA_ENABLE: usize = 332;
+pub const COMPAT_60_SA_SETCONCURRENCY: usize = 333;
+pub const COMPAT_60_SA_YIELD: usize = 334;
+pub const COMPAT_60_SA_PREEMPT: usize = 335;
+pub const __SIGACTION_SIGTRAMP: usize = 340;
+pub const RASCTL: usize = 343;
+pub const KQUEUE: usize = 344;
+pub const COMPAT_50_KEVENT: usize = 345;
+pub const _SCHED_SETPARAM: usize = 346;
+pub const _SCHED_GETPARAM: usize = 347;
+pub const _SCHED_SETAFFINITY: usize = 348;
+pub const _SCHED_GETAFFINITY: usize = 349;
+pub const SCHED_YIELD: usize = 350;
+pub const _SCHED_PROTECT: usize = 351;
+pub const FSYNC_RANGE: usize = 354;
+pub const UUIDGEN: usize = 355;
+pub const GETVFSSTAT: usize = 356;
+pub const STATVFS1: usize = 357;
+pub const FSTATVFS1: usize = 358;
+pub const COMPAT_30_FHSTATVFS1: usize = 359;
+pub const EXTATTRCTL: usize = 360;
+pub const EXTATTR_SET_FILE: usize = 361;
+pub const EXTATTR_GET_FILE: usize = 362;
+pub const EXTATTR_DELETE_FILE: usize = 363;
+pub const EXTATTR_SET_FD: usize = 364;
+pub const EXTATTR_GET_FD: usize = 365;
+pub const EXTATTR_DELETE_FD: usize = 366;
+pub const EXTATTR_SET_LINK: usize = 367;
+pub const EXTATTR_GET_LINK: usize = 368;
+pub const EXTATTR_DELETE_LINK: usize = 369;
+pub const EXTATTR_LIST_FD: usize = 370;
+pub const EXTATTR_LIST_FILE: usize = 371;
+pub const EXTATTR_LIST_LINK: usize = 372;
+pub const COMPAT_50_PSELECT: usize = 373;
+pub const COMPAT_50_POLLTS: usize = 374;
+pub const SETXATTR: usize = 375;
+pub const LSETXATTR: usize = 376;
+pub const FSETXATTR: usize = 377;
+pub const GETXATTR: usize = 378;
+pub const LGETXATTR: usize = 379;
+pub const FGETXATTR: usize = 380;
+pub const LISTXATTR: usize = 381;
+pub const LLISTXATTR: usize = 382;
+pub const FLISTXATTR: usize = 383;
+pub const REMOVEXATTR: usize = 384;
+pub const LREMOVEXATTR: usize = 385;
+pub const FREMOVEXATTR: usize = 386;
+pub const COMPAT_50___STAT30: usize = 387;
+pub const COMPAT_50___FSTAT30: usize = 388;
+pub const COMPAT_50___LSTAT30: usize = 389;
+pub const __GETDENTS30: usize = 390;
+pub const COMPAT_30___FHSTAT30: usize = 392;
+pub const COMPAT_50___NTP_GETTIME30: usize = 393;
+pub const __SOCKET30: usize = 394;
+pub const __GETFH30: usize = 395;
+pub const __FHOPEN40: usize = 396;
+pub const __FHSTATVFS140: usize = 397;
+pub const COMPAT_50___FHSTAT40: usize = 398;
+pub const AIO_CANCEL: usize = 399;
+pub const AIO_ERROR: usize = 400;
+pub const AIO_FSYNC: usize = 401;
+pub const AIO_READ: usize = 402;
+pub const AIO_RETURN: usize = 403;
+pub const COMPAT_50_AIO_SUSPEND: usize = 404;
+pub const AIO_WRITE: usize = 405;
+pub const LIO_LISTIO: usize = 406;
+pub const __MOUNT50: usize = 410;
+pub const MREMAP: usize = 411;
+pub const PSET_CREATE: usize = 412;
+pub const PSET_DESTROY: usize = 413;
+pub const PSET_ASSIGN: usize = 414;
+pub const _PSET_BIND: usize = 415;
+pub const __POSIX_FADVISE50: usize = 416;
+pub const __SELECT50: usize = 417;
+pub const __GETTIMEOFDAY50: usize = 418;
+pub const __SETTIMEOFDAY50: usize = 419;
+pub const __UTIMES50: usize = 420;
+pub const __ADJTIME50: usize = 421;
+pub const __LFS_SEGWAIT50: usize = 422;
+pub const __FUTIMES50: usize = 423;
+pub const __LUTIMES50: usize = 424;
+pub const __SETITIMER50: usize = 425;
+pub const __GETITIMER50: usize = 426;
+pub const __CLOCK_GETTIME50: usize = 427;
+pub const __CLOCK_SETTIME50: usize = 428;
+pub const __CLOCK_GETRES50: usize = 429;
+pub const __NANOSLEEP50: usize = 430;
+pub const ____SIGTIMEDWAIT50: usize = 431;
+pub const __MQ_TIMEDSEND50: usize = 432;
+pub const __MQ_TIMEDRECEIVE50: usize = 433;
+pub const COMPAT_60__LWP_PARK: usize = 434;
+pub const __KEVENT50: usize = 435;
+pub const __PSELECT50: usize = 436;
+pub const __POLLTS50: usize = 437;
+pub const __AIO_SUSPEND50: usize = 438;
+pub const __STAT50: usize = 439;
+pub const __FSTAT50: usize = 440;
+pub const __LSTAT50: usize = 441;
+pub const ____SEMCTL50: usize = 442;
+pub const __SHMCTL50: usize = 443;
+pub const __MSGCTL50: usize = 444;
+pub const __GETRUSAGE50: usize = 445;
+pub const __TIMER_SETTIME50: usize = 446;
+pub const __TIMER_GETTIME50: usize = 447;
+pub const __NTP_GETTIME50: usize = 448;
+pub const __WAIT450: usize = 449;
+pub const __MKNOD50: usize = 450;
+pub const __FHSTAT50: usize = 451;
+pub const PIPE2: usize = 453;
+pub const DUP3: usize = 454;
+pub const KQUEUE1: usize = 455;
+pub const PACCEPT: usize = 456;
+pub const LINKAT: usize = 457;
+pub const RENAMEAT: usize = 458;
+pub const MKFIFOAT: usize = 459;
+pub const MKNODAT: usize = 460;
+pub const MKDIRAT: usize = 461;
+pub const FACCESSAT: usize = 462;
+pub const FCHMODAT: usize = 463;
+pub const FCHOWNAT: usize = 464;
+pub const FEXECVE: usize = 465;
+pub const FSTATAT: usize = 466;
+pub const UTIMENSAT: usize = 467;
+pub const OPENAT: usize = 468;
+pub const READLINKAT: usize = 469;
+pub const SYMLINKAT: usize = 470;
+pub const UNLINKAT: usize = 471;
+pub const FUTIMENS: usize = 472;
+pub const __QUOTACTL: usize = 473;
+pub const POSIX_SPAWN: usize = 474;
+pub const RECVMMSG: usize = 475;
+pub const SENDMMSG: usize = 476;
+pub const CLOCK_NANOSLEEP: usize = 477;
+pub const ___LWP_PARK60: usize = 478;
+pub const POSIX_FALLOCATE: usize = 479;
+pub const FDISCARD: usize = 480;
+pub const WAIT6: usize = 481;
+pub const CLOCK_GETCPUCLOCKID2: usize = 482;
+pub const MAXSYSCALL: usize = 483;
+pub const NSYSENT: usize = 512;
diff --git a/tools/nr_from_src.ion b/tools/nr_from_src.ion
new file mode 100755
index 0000000..1e25c93
--- /dev/null
+++ b/tools/nr_from_src.ion
@@ -0,0 +1,12 @@
+#!/usr/bin/env ion
+# automatically generates nr.rs from the NetBSD header `syscall.h`
+# located at <topsrcdir>/sys/sys/syscall.h
+#
+# usage: nr_from_src.ion <path_to_syscall.h> > nr.rs
+
+for ln in @lines($(grep '#define' @args[1] | expand))
+    let sc = @split($ln)[1]
+    let sc = $to_uppercase($sc[4..])
+    let n = @split($ln)[2]
+    echo "pub const $sc: usize = $n;"
+end