diff --git a/src/unix/bsd/freebsdlike/mod.rs b/src/unix/bsd/freebsdlike/mod.rs
index 6ae8c212..f30035a1 100644
--- a/src/unix/bsd/freebsdlike/mod.rs
+++ b/src/unix/bsd/freebsdlike/mod.rs
@@ -1001,6 +1001,8 @@ extern {
     pub fn getpriority(which: ::c_int, who: ::c_int) -> ::c_int;
     pub fn setpriority(which: ::c_int, who: ::c_int, prio: ::c_int) -> ::c_int;
 
+    pub fn fdopendir(fd: ::c_int) -> *mut ::DIR;
+
     pub fn mknodat(dirfd: ::c_int, pathname: *const ::c_char,
                   mode: ::mode_t, dev: dev_t) -> ::c_int;
     pub fn mkfifoat(dirfd: ::c_int, pathname: *const ::c_char,
diff --git a/src/unix/bsd/netbsdlike/mod.rs b/src/unix/bsd/netbsdlike/mod.rs
index adf1771f..1471e6f3 100644
--- a/src/unix/bsd/netbsdlike/mod.rs
+++ b/src/unix/bsd/netbsdlike/mod.rs
@@ -597,6 +597,8 @@ extern {
     pub fn getpriority(which: ::c_int, who: ::id_t) -> ::c_int;
     pub fn setpriority(which: ::c_int, who: ::id_t, prio: ::c_int) -> ::c_int;
 
+    pub fn fdopendir(fd: ::c_int) -> *mut ::DIR;
+
     pub fn mknodat(dirfd: ::c_int, pathname: *const ::c_char,
                    mode: ::mode_t, dev: dev_t) -> ::c_int;
     pub fn mkfifoat(dirfd: ::c_int, pathname: *const ::c_char,
diff --git a/src/unix/haiku/mod.rs b/src/unix/haiku/mod.rs
index c4b44676..829c2258 100644
--- a/src/unix/haiku/mod.rs
+++ b/src/unix/haiku/mod.rs
@@ -761,6 +761,7 @@ extern {
     pub fn waitid(idtype: idtype_t, id: id_t, infop: *mut ::siginfo_t,
                   options: ::c_int) -> ::c_int;
 
+    pub fn fdopendir(fd: ::c_int) -> *mut ::DIR;
     pub fn glob(pattern: *const ::c_char,
                 flags: ::c_int,
                 errfunc: Option<extern fn(epath: *const ::c_char,
diff --git a/src/unix/notbsd/mod.rs b/src/unix/notbsd/mod.rs
index 82de63e7..3f646f11 100644
--- a/src/unix/notbsd/mod.rs
+++ b/src/unix/notbsd/mod.rs
@@ -928,6 +928,8 @@ extern {
     pub fn eventfd(init: ::c_uint, flags: ::c_int) -> ::c_int;
     pub fn sysinfo (info: *mut ::sysinfo) -> ::c_int;
 
+    pub fn fdopendir(fd: ::c_int) -> *mut ::DIR;
+
     pub fn mknodat(dirfd: ::c_int, pathname: *const ::c_char,
                    mode: ::mode_t, dev: dev_t) -> ::c_int;
     pub fn ppoll(fds: *mut ::pollfd,
diff --git a/src/unix/solaris/mod.rs b/src/unix/solaris/mod.rs
index 2519fcdb..8c0d111a 100644
--- a/src/unix/solaris/mod.rs
+++ b/src/unix/solaris/mod.rs
@@ -1058,6 +1058,8 @@ extern {
     pub fn getpriority(which: ::c_int, who: ::c_int) -> ::c_int;
     pub fn setpriority(which: ::c_int, who: ::c_int, prio: ::c_int) -> ::c_int;
 
+    pub fn fdopendir(fd: ::c_int) -> *mut ::DIR;
+
     pub fn mknodat(dirfd: ::c_int, pathname: *const ::c_char,
                    mode: ::mode_t, dev: dev_t) -> ::c_int;
     pub fn mkfifoat(dirfd: ::c_int, pathname: *const ::c_char,