--- a/vendor/libc-0.2.174/src/unix/bsd/apple/b64/mod.rs
+++ b/vendor/libc-0.2.174/src/unix/bsd/apple/b64/mod.rs
@@ -63,6 +63,9 @@ cfg_if! {
     } else if #[cfg(target_arch = "aarch64")] {
         mod aarch64;
         pub use self::aarch64::*;
+    } else if #[cfg(target_arch = "powerpc64")] {
+        mod powerpc64;
+        pub use self::powerpc64::*;
     } else {
         // Unknown target_arch
     }
--- /dev/null
+++ b/vendor/libc-0.2.174/src/unix/bsd/apple/b64/powerpc64/mod.rs
@@ -0,0 +1,68 @@
+use crate::prelude::*;
+
+pub type boolean_t = c_uint;
+
+s! {
+    pub struct malloc_introspection_t {
+        _private: [crate::uintptr_t; 16], // FIXME(macos): keeping private for now
+    }
+
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
+    pub struct malloc_zone_t {
+        _reserved1: Padding<*mut c_void>,
+        _reserved2: Padding<*mut c_void>,
+        pub size:
+            Option<unsafe extern "C" fn(zone: *mut malloc_zone_t, ptr: *const c_void) -> size_t>,
+        pub malloc:
+            Option<unsafe extern "C" fn(zone: *mut malloc_zone_t, size: size_t) -> *mut c_void>,
+        pub calloc: Option<
+            unsafe extern "C" fn(
+                zone: *mut malloc_zone_t,
+                num_items: size_t,
+                size: size_t,
+            ) -> *mut c_void,
+        >,
+        pub valloc:
+            Option<unsafe extern "C" fn(zone: *mut malloc_zone_t, size: size_t) -> *mut c_void>,
+        pub free: Option<unsafe extern "C" fn(zone: *mut malloc_zone_t, ptr: *mut c_void)>,
+        pub realloc: Option<
+            unsafe extern "C" fn(
+                zone: *mut malloc_zone_t,
+                ptr: *mut c_void,
+                size: size_t,
+            ) -> *mut c_void,
+        >,
+        pub destroy: Option<unsafe extern "C" fn(zone: *mut malloc_zone_t)>,
+        pub zone_name: *const c_char,
+        pub batch_malloc: Option<
+            unsafe extern "C" fn(
+                zone: *mut malloc_zone_t,
+                size: size_t,
+                results: *mut *mut c_void,
+                num_requested: c_uint,
+            ) -> c_uint,
+        >,
+        pub batch_free: Option<
+            unsafe extern "C" fn(
+                zone: *mut malloc_zone_t,
+                to_be_freed: *mut *mut c_void,
+                num_to_be_freed: c_uint,
+            ),
+        >,
+        pub introspect: *mut malloc_introspection_t,
+        pub version: c_uint,
+        pub memalign: Option<
+            unsafe extern "C" fn(
+                zone: *mut malloc_zone_t,
+                alignment: size_t,
+                size: size_t,
+            ) -> *mut c_void,
+        >,
+        pub free_definite_size:
+            Option<unsafe extern "C" fn(zone: *mut malloc_zone_t, ptr: *mut c_void, size: size_t)>,
+        pub pressure_relief:
+            Option<unsafe extern "C" fn(zone: *mut malloc_zone_t, goal: size_t) -> size_t>,
+        pub claimed_address: Option<
+            unsafe extern "C" fn(zone: *mut malloc_zone_t, ptr: *mut c_void) -> crate::boolean_t,
+        >,
+    }
+}
+
+s_no_extra_traits! {
+    #[repr(align(16))]
+    pub struct max_align_t {
+        priv_: [f64; 2],
+    }
+}