diff --git a/build.rs b/build.rs
index 54f9d0a..6ccc913 100644
--- a/build.rs
+++ b/build.rs
@@ -2,9 +2,11 @@ fn main() {
     let target_os = std::env::var("CARGO_CFG_TARGET_OS").unwrap();
     let target_env = std::env::var("CARGO_CFG_TARGET_ENV").unwrap();
 
+    println!("cargo:rustc-check-cfg=cfg(target_os, values(\"switch\"))");
     let has_prlimit64 = (target_os == "android" && target_env != "newlib")
         || ((target_env == "gnu" || target_env == "musl" || target_env == "ohos")
             && (target_os == "l4re" || target_os == "linux"));
+    println!("cargo:rustc-check-cfg=cfg(rlimit__has_prlimit64)");
     if has_prlimit64 {
         println!("cargo:rustc-cfg=rlimit__has_prlimit64");
     }
@@ -16,6 +18,7 @@ fn main() {
         || target_os == "tvos"
         || target_os == "watchos")
         && target_env != "newlib";
+    println!("cargo:rustc-check-cfg=cfg(rlimit__get_kern_max_files_per_proc)");
     if get_kern_max_files_per_proc {
         println!("cargo:rustc-cfg=rlimit__get_kern_max_files_per_proc");
     }
diff --git a/codegen/src/build.rs b/codegen/src/build.rs
index 365a82f..21ac916 100644
--- a/codegen/src/build.rs
+++ b/codegen/src/build.rs
@@ -64,6 +64,7 @@ fn set_cfg_if(key: &str, cfg: &Expr) {
     };
 
     g!("let {key} = {cfg};");
+    g!(r#"println!("cargo:rustc-check-cfg=cfg(rlimit__{key})");"#);
     g!("if {key} {{");
     g!(r#"println!("cargo:rustc-cfg=rlimit__{key}");"#);
     g!("}}");
@@ -85,6 +86,12 @@ pub fn codegen(item_list: &[CfgItem]) {
         g!();
     }
 
+    {
+        let extra_os = ["switch"];
+        let values = extra_os.join("\",\"");
+        g!(r#"println!("cargo:rustc-check-cfg=cfg(target_os, values(\"{values}\"))");"#)
+    }
+
     forward_item_cfg(item_list, "prlimit64");
 
     {