diff --git a/lib/std/c/dragonfly.zig b/lib/std/c/dragonfly.zig
index bf14372e9f..d4f2867fda 100644
--- a/lib/std/c/dragonfly.zig
+++ b/lib/std/c/dragonfly.zig
@@ -1143,20 +1143,3 @@ pub const POLL = struct {
     pub const HUP = 0x0010;
     pub const NVAL = 0x0020;
 };
-
-pub const SIGEV = struct {
-    pub const NONE = 0;
-    pub const SIGNAL = 1;
-    pub const THREAD = 2;
-};
-
-pub const sigevent = extern struct {
-    sigev_notify: c_int,
-    __sigev_u: extern union {
-        __sigev_signo: c_int,
-        __sigev_notify_kqueue: c_int,
-        __sigev_notify_attributes: ?*pthread_attr_t,
-    },
-    sigev_value: sigval,
-    sigev_notify_function: ?*const fn (sigval) callconv(.C) void,
-};
diff --git a/lib/std/c/freebsd.zig b/lib/std/c/freebsd.zig
index 539b65617b..d224b6fdab 100644
--- a/lib/std/c/freebsd.zig
+++ b/lib/std/c/freebsd.zig
@@ -2248,28 +2248,3 @@ pub const shm_largeconf = extern struct {
 pub extern "c" fn shm_create_largepage(path: [*:0]const u8, flags: c_int, psind: c_int, alloc_policy: c_int, mode: mode_t) c_int;
 
 pub extern "c" fn elf_aux_info(aux: c_int, buf: ?*anyopaque, buflen: c_int) c_int;
-
-pub const lwpid = i32;
-
-pub const SIGEV = struct {
-    pub const NONE = 0;
-    pub const SIGNAL = 1;
-    pub const THREAD = 2;
-    pub const KEVENT = 3;
-    pub const THREAD_ID = 4;
-};
-
-pub const sigevent = extern struct {
-    sigev_notify: c_int,
-    sigev_signo: c_int,
-    sigev_value: sigval,
-    _sigev_un: extern union {
-        _threadid: lwpid,
-        _sigev_thread: extern struct {
-            _function: ?*const fn (sigval) callconv(.C) void,
-            _attribute: ?**pthread_attr_t,
-        },
-        _kevent_flags: c_ushort,
-        __spare__: [8]c_long,
-    },
-};
diff --git a/lib/std/c/haiku.zig b/lib/std/c/haiku.zig
index fafc4523fb..a64eb03b41 100644
--- a/lib/std/c/haiku.zig
+++ b/lib/std/c/haiku.zig
@@ -1038,22 +1038,3 @@ pub const termios = extern struct {
 };
 
 pub const MSG_NOSIGNAL = 0x0800;
-
-pub const SIGEV = struct {
-    pub const NONE = 0;
-    pub const SIGNAL = 1;
-    pub const THREAD = 2;
-};
-
-pub const sigval = extern union {
-    int: c_int,
-    ptr: ?*anyopaque,
-};
-
-pub const sigevent = extern struct {
-    sigev_notify: c_int,
-    sigev_signo: c_int,
-    sigev_value: sigval,
-    sigev_notify_function: ?*const fn (sigval) callconv(.C) void,
-    sigev_notify_attributes: ?*pthread_attr_t,
-};
diff --git a/lib/std/c/netbsd.zig b/lib/std/c/netbsd.zig
index 03ca0f481c..d10e40b1d3 100644
--- a/lib/std/c/netbsd.zig
+++ b/lib/std/c/netbsd.zig
@@ -1633,22 +1633,3 @@ pub const POLL = struct {
     pub const HUP = 0x0010;
     pub const NVAL = 0x0020;
 };
-
-pub const SIGEV = struct {
-    pub const NONE = 0;
-    pub const SIGNAL = 1;
-    pub const THREAD = 2;
-};
-
-pub const sigval = extern union {
-    int: c_int,
-    ptr: ?*anyopaque,
-};
-
-pub const sigevent = extern struct {
-    sigev_notify: c_int,
-    sigev_signo: c_int,
-    sigev_value: sigval,
-    sigev_notify_function: ?*const fn (sigval) callconv(.C) void,
-    sigev_notify_attributes: ?*pthread_attr_t,
-};
diff --git a/lib/std/c/solaris.zig b/lib/std/c/solaris.zig
index 4f81952374..195dc5fd37 100644
--- a/lib/std/c/solaris.zig
+++ b/lib/std/c/solaris.zig
@@ -1927,22 +1927,3 @@ pub fn IOW(io_type: u8, nr: u8, comptime IOT: type) i32 {
 pub fn IOWR(io_type: u8, nr: u8, comptime IOT: type) i32 {
     return ioImpl(.read_write, io_type, nr, IOT);
 }
-
-pub const SIGEV = struct {
-    pub const NONE = 0;
-    pub const SIGNAL = 1;
-    pub const THREAD = 2;
-};
-
-pub const sigval = extern union {
-    int: c_int,
-    ptr: ?*anyopaque,
-};
-
-pub const sigevent = extern struct {
-    sigev_notify: c_int,
-    sigev_signo: c_int,
-    sigev_value: sigval,
-    sigev_notify_function: ?*const fn (sigval) callconv(.C) void,
-    sigev_notify_attributes: ?*pthread_attr_t,
-};