diff --git a/src/etc/libc.c b/src/etc/libc.c
index 2bf919d7e2cc..249b5d22b6b2 100644
--- a/src/etc/libc.c
+++ b/src/etc/libc.c
@@ -165,6 +165,16 @@ void posix88_consts() {
   put_const(S_IWUSR, int);
   put_const(S_IRUSR, int);
 
+  put_const(S_IRWXG, int);
+  put_const(S_IXGRP, int);
+  put_const(S_IWGRP, int);
+  put_const(S_IRGRP, int);
+
+  put_const(S_IRWXO, int);
+  put_const(S_IXOTH, int);
+  put_const(S_IWOTH, int);
+  put_const(S_IROTH, int);
+
 #ifdef F_OK
   put_const(F_OK, int);
 #endif
diff --git a/src/liblibc/lib.rs b/src/liblibc/lib.rs
index 893781e62209..16570086d43c 100644
--- a/src/liblibc/lib.rs
+++ b/src/liblibc/lib.rs
@@ -2461,6 +2461,14 @@ pub mod consts {
             pub const S_IXUSR : c_int = 64;
             pub const S_IWUSR : c_int = 128;
             pub const S_IRUSR : c_int = 256;
+            pub const S_IRWXG : mode_t = 56;
+            pub const S_IXGRP : mode_t = 8;
+            pub const S_IWGRP : mode_t = 16;
+            pub const S_IRGRP : mode_t = 32;
+            pub const S_IRWXO : mode_t = 7;
+            pub const S_IXOTH : mode_t = 1;
+            pub const S_IWOTH : mode_t = 2;
+            pub const S_IROTH : mode_t = 4;
             pub const F_OK : c_int = 0;
             pub const R_OK : c_int = 4;
             pub const W_OK : c_int = 2;
@@ -2797,6 +2805,14 @@ pub mod consts {
             pub const S_IXUSR : mode_t = 64;
             pub const S_IWUSR : mode_t = 128;
             pub const S_IRUSR : mode_t = 256;
+            pub const S_IRWXG : mode_t = 56;
+            pub const S_IXGRP : mode_t = 8;
+            pub const S_IWGRP : mode_t = 16;
+            pub const S_IRGRP : mode_t = 32;
+            pub const S_IRWXO : mode_t = 7;
+            pub const S_IXOTH : mode_t = 1;
+            pub const S_IWOTH : mode_t = 2;
+            pub const S_IROTH : mode_t = 4;
             pub const F_OK : c_int = 0;
             pub const R_OK : c_int = 4;
             pub const W_OK : c_int = 2;
@@ -3010,6 +3026,14 @@ pub mod consts {
             pub const S_IXUSR : mode_t = 64;
             pub const S_IWUSR : mode_t = 128;
             pub const S_IRUSR : mode_t = 256;
+            pub const S_IRWXG : mode_t = 56;
+            pub const S_IXGRP : mode_t = 8;
+            pub const S_IWGRP : mode_t = 16;
+            pub const S_IRGRP : mode_t = 32;
+            pub const S_IRWXO : mode_t = 7;
+            pub const S_IXOTH : mode_t = 1;
+            pub const S_IWOTH : mode_t = 2;
+            pub const S_IROTH : mode_t = 4;
             pub const F_OK : c_int = 0;
             pub const R_OK : c_int = 4;
             pub const W_OK : c_int = 2;
@@ -3710,6 +3734,14 @@ pub mod consts {
             pub const S_IXUSR : mode_t = 64;
             pub const S_IWUSR : mode_t = 128;
             pub const S_IRUSR : mode_t = 256;
+            pub const S_IRWXG : mode_t = 56;
+            pub const S_IXGRP : mode_t = 8;
+            pub const S_IWGRP : mode_t = 16;
+            pub const S_IRGRP : mode_t = 32;
+            pub const S_IRWXO : mode_t = 7;
+            pub const S_IXOTH : mode_t = 1;
+            pub const S_IWOTH : mode_t = 2;
+            pub const S_IROTH : mode_t = 4;
             pub const F_OK : c_int = 0;
             pub const R_OK : c_int = 4;
             pub const W_OK : c_int = 2;
@@ -4142,6 +4174,14 @@ pub mod consts {
             pub const S_IXUSR : mode_t = 64;
             pub const S_IWUSR : mode_t = 128;
             pub const S_IRUSR : mode_t = 256;
+            pub const S_IRWXG : mode_t = 56;
+            pub const S_IXGRP : mode_t = 8;
+            pub const S_IWGRP : mode_t = 16;
+            pub const S_IRGRP : mode_t = 32;
+            pub const S_IRWXO : mode_t = 7;
+            pub const S_IXOTH : mode_t = 1;
+            pub const S_IWOTH : mode_t = 2;
+            pub const S_IROTH : mode_t = 4;
             pub const F_OK : c_int = 0;
             pub const R_OK : c_int = 4;
             pub const W_OK : c_int = 2;
@@ -4540,6 +4580,14 @@ pub mod consts {
             pub const S_IXUSR : mode_t = 64;
             pub const S_IWUSR : mode_t = 128;
             pub const S_IRUSR : mode_t = 256;
+            pub const S_IRWXG : mode_t = 56;
+            pub const S_IXGRP : mode_t = 8;
+            pub const S_IWGRP : mode_t = 16;
+            pub const S_IRGRP : mode_t = 32;
+            pub const S_IRWXO : mode_t = 7;
+            pub const S_IXOTH : mode_t = 1;
+            pub const S_IWOTH : mode_t = 2;
+            pub const S_IROTH : mode_t = 4;
             pub const F_OK : c_int = 0;
             pub const R_OK : c_int = 4;
             pub const W_OK : c_int = 2;