diff --git a/libc-test/build.rs b/libc-test/build.rs
index a0e0380e61a96..8ec239ddf89d3 100644
--- a/libc-test/build.rs
+++ b/libc-test/build.rs
@@ -199,6 +199,7 @@ fn test_apple(target: &str) {
         "errno.h",
         "execinfo.h",
         "fcntl.h",
+        "getopt.h",
         "glob.h",
         "grp.h",
         "iconv.h",
@@ -421,6 +422,7 @@ fn test_openbsd(target: &str) {
         "errno.h",
         "execinfo.h",
         "fcntl.h",
+        "getopt.h",
         "libgen.h",
         "limits.h",
         "link.h",
@@ -769,6 +771,7 @@ fn test_solarish(target: &str) {
         "errno.h",
         "execinfo.h",
         "fcntl.h",
+        "getopt.h",
         "glob.h",
         "grp.h",
         "ifaddrs.h",
@@ -997,6 +1000,7 @@ fn test_netbsd(target: &str) {
         "elf.h",
         "errno.h",
         "fcntl.h",
+        "getopt.h",
         "libgen.h",
         "limits.h",
         "link.h",
@@ -1208,6 +1212,7 @@ fn test_dragonflybsd(target: &str) {
         "errno.h",
         "execinfo.h",
         "fcntl.h",
+        "getopt.h",
         "glob.h",
         "grp.h",
         "ifaddrs.h",
@@ -1884,6 +1889,7 @@ fn test_freebsd(target: &str) {
                 "errno.h",
                 "execinfo.h",
                 "fcntl.h",
+                "getopt.h",
                 "glob.h",
                 "grp.h",
                 "iconv.h",
@@ -2803,6 +2809,7 @@ fn test_linux(target: &str) {
                "dlfcn.h",
                "elf.h",
                "fcntl.h",
+               "getopt.h",
                "glob.h",
                [gnu]: "gnu/libc-version.h",
                "grp.h",
diff --git a/libc-test/semver/unix.txt b/libc-test/semver/unix.txt
index 269c0ff0e5846..c7357b941ebee 100644
--- a/libc-test/semver/unix.txt
+++ b/libc-test/semver/unix.txt
@@ -559,6 +559,7 @@ getgroups
 gethostname
 getlogin
 getopt
+getopt_long
 getpeername
 getpgid
 getpgrp
diff --git a/src/unix/mod.rs b/src/unix/mod.rs
index fb9ebf792e53d..006e59c21ec8a 100644
--- a/src/unix/mod.rs
+++ b/src/unix/mod.rs
@@ -201,6 +201,13 @@ s! {
         pub p_aliases: *mut *mut ::c_char,
         pub p_proto: ::c_int,
     }
+
+    pub struct option {
+        pub name: *const ::c_char,
+        pub has_arg: ::c_int,
+        pub flag: *mut ::c_int,
+        pub val: ::c_int,
+    }
 }
 
 pub const INT_MIN: c_int = -2147483648;
@@ -881,6 +888,13 @@ extern "C" {
         link_name = "getopt$UNIX2003"
     )]
     pub fn getopt(argc: ::c_int, argv: *const *mut c_char, optstr: *const c_char) -> ::c_int;
+    pub fn getopt_long(
+        argc: ::c_int,
+        argv: *const *mut c_char,
+        optstring: *const c_char,
+        longopts: *const option,
+        longindex: *mut ::c_int,
+    ) -> ::c_int;
     pub fn getpgid(pid: pid_t) -> pid_t;
     pub fn getpgrp() -> pid_t;
     pub fn getpid() -> pid_t;