diff --git a/src/uucore/src/lib/features/entries.rs b/src/uucore/src/lib/features/entries.rs
index fa10ba2de..e2cbafa59 100644
--- a/src/uucore/src/lib/features/entries.rs
+++ b/src/uucore/src/lib/features/entries.rs
@@ -124,7 +124,7 @@ pub fn get_groups_gnu(arg_id: Option<u32>) -> IOResult<Vec<gid_t>> {
     Ok(sort_groups(groups, egid))
 }
 
-#[cfg(all(unix, feature = "process"))]
+#[cfg(all(unix, not(target_os = "redox"), feature = "process"))]
 fn sort_groups(mut groups: Vec<gid_t>, egid: gid_t) -> Vec<gid_t> {
     if let Some(index) = groups.iter().position(|&x| x == egid) {
         groups[..=index].rotate_right(1);
diff --git a/src/uucore/src/lib/features/fsext.rs b/src/uucore/src/lib/features/fsext.rs
index d02d74bab..a49b1e536 100644
--- a/src/uucore/src/lib/features/fsext.rs
+++ b/src/uucore/src/lib/features/fsext.rs
@@ -14,7 +14,7 @@ use time::UtcOffset;
 const LINUX_MTAB: &str = "/etc/mtab";
 #[cfg(any(target_os = "linux", target_os = "android"))]
 const LINUX_MOUNTINFO: &str = "/proc/self/mountinfo";
-#[cfg(unix)]
+#[cfg(all(unix, not(target_os = "redox")))]
 static MOUNT_OPT_BIND: &str = "bind";
 #[cfg(windows)]
 const MAX_PATH: usize = 266;
@@ -318,7 +318,7 @@ impl From<StatFs> for MountInfo {
     }
 }
 
-#[cfg(unix)]
+#[cfg(all(unix, not(target_os = "redox")))]
 fn is_dummy_filesystem(fs_type: &str, mount_option: &str) -> bool {
     // spell-checker:disable
     match fs_type {
@@ -337,14 +337,14 @@ fn is_dummy_filesystem(fs_type: &str, mount_option: &str) -> bool {
     // spell-checker:enable
 }
 
-#[cfg(unix)]
+#[cfg(all(unix, not(target_os = "redox")))]
 fn is_remote_filesystem(dev_name: &str, fs_type: &str) -> bool {
     dev_name.find(':').is_some()
         || (dev_name.starts_with("//") && fs_type == "smbfs" || fs_type == "cifs")
         || dev_name == "-hosts"
 }
 
-#[cfg(unix)]
+#[cfg(all(unix, not(target_os = "redox")))]
 fn mount_dev_id(mount_dir: &str) -> String {
     use std::os::unix::fs::MetadataExt;