diff --git a/libc-test/semver/apple.txt b/libc-test/semver/apple.txt
index ae81735586be2..b51019fbb5635 100644
--- a/libc-test/semver/apple.txt
+++ b/libc-test/semver/apple.txt
@@ -1511,6 +1511,10 @@ XATTR_SHOWCOMPRESSION
 XUCRED_VERSION
 YESEXPR
 YESSTR
+_CS_PATH
+_CS_DARWIN_USER_DIR
+_CS_DARWIN_USER_TEMP_DIR
+_CS_DARWIN_USER_CACHE_DIR
 _IOFBF
 _IOLBF
 _IONBF
@@ -1685,6 +1689,7 @@ clock_getres
 clonefile
 clonefileat
 cmsghdr
+confstr
 connectx
 copyfile
 copyfile_flags_t
diff --git a/src/unix/bsd/apple/mod.rs b/src/unix/bsd/apple/mod.rs
index d3cd8503491be..bdff209dc6468 100644
--- a/src/unix/bsd/apple/mod.rs
+++ b/src/unix/bsd/apple/mod.rs
@@ -3800,6 +3800,11 @@ pub const _SC_TRACE_NAME_MAX: ::c_int = 128;
 pub const _SC_TRACE_SYS_MAX: ::c_int = 129;
 pub const _SC_TRACE_USER_EVENT_MAX: ::c_int = 130;
 pub const _SC_PASS_MAX: ::c_int = 131;
+// `confstr` keys (only the values guaranteed by `man confstr`).
+pub const _CS_PATH: ::c_int = 1;
+pub const _CS_DARWIN_USER_DIR: ::c_int = 65536;
+pub const _CS_DARWIN_USER_TEMP_DIR: ::c_int = 65537;
+pub const _CS_DARWIN_USER_CACHE_DIR: ::c_int = 65538;
 
 pub const PTHREAD_MUTEX_NORMAL: ::c_int = 0;
 pub const PTHREAD_MUTEX_ERRORCHECK: ::c_int = 1;
@@ -4850,6 +4855,11 @@ extern "C" {
     pub fn fchflags(fd: ::c_int, flags: ::c_uint) -> ::c_int;
     pub fn clock_getres(clk_id: ::clockid_t, tp: *mut ::timespec) -> ::c_int;
     pub fn clock_gettime(clk_id: ::clockid_t, tp: *mut ::timespec) -> ::c_int;
+    #[cfg_attr(
+        all(target_os = "macos", target_arch = "x86"),
+        link_name = "confstr$UNIX2003"
+    )]
+    pub fn confstr(name: ::c_int, buf: *mut ::c_char, len: ::size_t) -> ::size_t;
     pub fn lio_listio(
         mode: ::c_int,
         aiocb_list: *const *mut aiocb,