diff --git a/src/unix/mod.rs b/src/unix/mod.rs
index a6e6026ec28c..432dd31ab993 100644
--- a/src/unix/mod.rs
+++ b/src/unix/mod.rs
@@ -1834,18 +1834,31 @@ cfg_if! {
 }
 
 cfg_if! {
-    if #[cfg(target_os = "aix")] {
+    if #[cfg(any(target_os = "aix", target_os = "nto"))] {
         extern "C" {
             pub fn cfmakeraw(termios: *mut crate::termios) -> c_int;
+        }
+    } else if #[cfg(not(any(target_os = "solaris", target_os = "illumos",)))] {
+        extern "C" {
+            pub fn cfmakeraw(termios: *mut crate::termios);
+        }
+    }
+}
+
+cfg_if! {
+    if #[cfg(any(
+        target_os = "aix",
+        all(target_os = "nto", target_env = "nto80")
+    ))] {
+        extern "C" {
             pub fn cfsetspeed(termios: *mut crate::termios, speed: crate::speed_t) -> c_int;
         }
     } else if #[cfg(not(any(
         target_os = "solaris",
         target_os = "illumos",
-        target_os = "nto",
+        target_os = "nto"
     )))] {
         extern "C" {
-            pub fn cfmakeraw(termios: *mut crate::termios);
             pub fn cfsetspeed(termios: *mut crate::termios, speed: crate::speed_t) -> c_int;
         }
     }