diff --git a/src/unix/bsd/freebsdlike/mod.rs b/src/unix/bsd/freebsdlike/mod.rs
index 73b6df96..011cf867 100644
--- a/src/unix/bsd/freebsdlike/mod.rs
+++ b/src/unix/bsd/freebsdlike/mod.rs
@@ -640,7 +640,8 @@ extern {
 
     pub fn posix_fadvise(fd: ::c_int, offset: ::off_t, len: ::off_t, 
                          advise: ::c_int) -> ::c_int;
-
+    pub fn mkostemp(template: *mut ::c_char, flags: ::c_int) -> ::c_int;
+    pub fn mkostemps(template: *mut ::c_char, suffixlen: ::c_int, flags: ::c_int) -> ::c_int;
 }
 
 cfg_if! {
diff --git a/src/unix/bsd/openbsdlike/mod.rs b/src/unix/bsd/openbsdlike/mod.rs
index ea116fbf..490e8056 100644
--- a/src/unix/bsd/openbsdlike/mod.rs
+++ b/src/unix/bsd/openbsdlike/mod.rs
@@ -389,6 +389,8 @@ extern {
     pub fn pthread_stackseg_np(thread: ::pthread_t,
                                sinfo: *mut ::stack_t) -> ::c_int;
     pub fn memrchr(cx: *const ::c_void, c: ::c_int, n: ::size_t) -> *mut ::c_void;
+    pub fn mkostemp(template: *mut ::c_char, flags: ::c_int) -> ::c_int;
+    pub fn mkostemps(template: *mut ::c_char, suffixlen: ::c_int, flags: ::c_int) -> ::c_int;
 }
 
 cfg_if! {
diff --git a/src/unix/mod.rs b/src/unix/mod.rs
index c56246a3..f2dbf7fa 100644
--- a/src/unix/mod.rs
+++ b/src/unix/mod.rs
@@ -678,6 +678,9 @@ extern {
     pub fn tcflow(fd: ::c_int, action: ::c_int) -> ::c_int;
     pub fn tcflush(fd: ::c_int, action: ::c_int) -> ::c_int;
     pub fn tcsendbreak(fd: ::c_int, duration: ::c_int) -> ::c_int;
+    pub fn mkstemp(template: *mut ::c_char) -> ::c_int;
+    pub fn mkstemps(template: *mut ::c_char, suffixlen: ::c_int) -> ::c_int;
+    pub fn mkdtemp(template: *mut ::c_char) -> *mut ::c_char;
 }
 
 cfg_if! {
diff --git a/src/unix/notbsd/linux/mod.rs b/src/unix/notbsd/linux/mod.rs
index a02efadd..510a33d0 100644
--- a/src/unix/notbsd/linux/mod.rs
+++ b/src/unix/notbsd/linux/mod.rs
@@ -540,6 +540,8 @@ extern {
     pub fn unshare(flags: ::c_int) -> ::c_int;
     pub fn sethostname(name: *const ::c_char, len: ::size_t) -> ::c_int;
     pub fn setns(fd: ::c_int, nstype: ::c_int) -> ::c_int;
+    pub fn mkostemp(template: *mut ::c_char, flags: ::c_int) -> ::c_int;
+    pub fn mkostemps(template: *mut ::c_char, suffixlen: ::c_int, flags: ::c_int) -> ::c_int;
 }
 
 cfg_if! {