--- a/libpam-sys/libpam-sys-helpers/src/constants.rs	Thu Jul 03 17:33:13 2025 -0400
+++ b/libpam-sys/libpam-sys-helpers/src/constants.rs	Thu Jul 03 20:55:40 2025 -0400
@@ -4,8 +4,6 @@
 //! `test_constants.rs`.
 
 #![allow(non_camel_case_types)]
-#![allow(unused_imports)]
-use num_enum::{IntoPrimitive, TryFromPrimitive};
 
 /// Macro to make defining a bunch of constants way easier.
 macro_rules! define {
@@ -76,7 +74,6 @@
 pub use linux_pam::*;
 #[cfg(pam_impl = "LinuxPam")]
 mod linux_pam {
-    use super::{IntoPrimitive, TryFromPrimitive};
     c_enum!(
         /// An error return code.
         PAM_OPEN_ERR = 1,
@@ -149,7 +146,7 @@
 
     pub const PAM_MODUTIL_NGROUPS: i32 = 64;
 
-    #[derive(Copy, Clone, Debug, PartialEq, Eq, TryFromPrimitive, IntoPrimitive)]
+    #[derive(Copy, Clone, Debug, PartialEq, Eq)]
     #[repr(i32)]
     pub enum pam_modutil_redirect_fd {
         PAM_MODUTIL_IGNORE_FD,
@@ -157,6 +154,22 @@
         PAM_MODUTIL_NULL_FD,
     }
 
+    impl From<pam_modutil_redirect_fd> for i32 {
+        fn from(value: pam_modutil_redirect_fd) -> Self {
+            value as Self
+        }
+    }
+
+    impl TryFrom<i32> for pam_modutil_redirect_fd {
+        type Error = i32;
+        fn try_from(value: i32) -> Result<Self, Self::Error> {
+            match value {
+                0..=2 => Ok(unsafe { *(&value as *const i32).cast() }),
+                other => Err(other),
+            }
+        }
+    }
+
     pub use pam_modutil_redirect_fd::*;
 }