diff --git a/library/modules/platform/android.sx b/library/modules/platform/android.sx
index f2c4a28..c6e1273 100644
--- a/library/modules/platform/android.sx
+++ b/library/modules/platform/android.sx
@@ -38,31 +38,31 @@
 
 // ── Foreign Java types ──────────────────────────────────────────────────
 
-Bundle   :: #foreign #jni_class("android/os/Bundle") { }
-JContext :: #foreign #jni_class("android/content/Context") {
+Bundle   :: #jni_class("android/os/Bundle") extern { }
+JContext :: #jni_class("android/content/Context") extern {
     getAssets :: (self: *Self) -> *AssetManagerJ;
 }
-AssetManagerJ :: #foreign #jni_class("android/content/res/AssetManager") { }
+AssetManagerJ :: #jni_class("android/content/res/AssetManager") extern { }
 
-Surface :: #foreign #jni_class("android/view/Surface") { }
-SurfaceHolder :: #foreign #jni_class("android/view/SurfaceHolder") {
+Surface :: #jni_class("android/view/Surface") extern { }
+SurfaceHolder :: #jni_class("android/view/SurfaceHolder") extern {
     getSurface  :: (self: *Self) -> *Surface;
     addCallback :: (self: *Self, cb: *SurfaceHolderCallback);
 }
-SurfaceView :: #foreign #jni_class("android/view/SurfaceView") {
+SurfaceView :: #jni_class("android/view/SurfaceView") extern {
     new        :: (ctx: *JContext) -> *Self;  // no `self: *Self` → class method
     getHolder  :: (self: *Self) -> *SurfaceHolder;
 }
-SurfaceHolderCallback :: #foreign #jni_class("android/view/SurfaceHolder$Callback") { }
+SurfaceHolderCallback :: #jni_class("android/view/SurfaceHolder$Callback") extern { }
 
-MotionEvent :: #foreign #jni_class("android/view/MotionEvent") {
+MotionEvent :: #jni_class("android/view/MotionEvent") extern {
     getAction :: (self: *Self) -> i32;
     getX      :: (self: *Self) -> f32;
     getY      :: (self: *Self) -> f32;
 }
 
-JView :: #foreign #jni_class("android/view/View") { }
-ActivityClass :: #foreign #jni_class("android/app/Activity") {
+JView :: #jni_class("android/view/View") extern { }
+ActivityClass :: #jni_class("android/app/Activity") extern {
     setContentView :: (self: *Self, v: *JView);
 }
 
@@ -70,25 +70,25 @@ ActivityClass :: #foreign #jni_class("android/app/Activity") {
 
 // C side of file_utils — installs the AAssetManager so `read_file_bytes`
 // can route through `AAssetManager_open` when running on Android.
-sx_android_set_asset_manager :: (mgr: *void) #foreign;
+sx_android_set_asset_manager :: (mgr: *void) extern;
 
-__android_log_print :: (prio: i32, tag: *u8, fmt: *u8) -> i32 #foreign;
-usleep              :: (us: u32) -> i32 #foreign;
+__android_log_print :: (prio: i32, tag: *u8, fmt: *u8) -> i32 extern;
+usleep              :: (us: u32) -> i32 extern;
 
 // libandroid
-ANativeWindow_fromSurface :: (env: *void, surface: *void) -> *void #foreign;
-ANativeWindow_release     :: (window: *void) #foreign;
-ANativeWindow_getWidth    :: (window: *void) -> i32 #foreign;
-ANativeWindow_getHeight   :: (window: *void) -> i32 #foreign;
-ANativeWindow_setBuffersGeometry :: (w: *void, width: i32, height: i32, fmt: i32) -> i32 #foreign;
+ANativeWindow_fromSurface :: (env: *void, surface: *void) -> *void extern;
+ANativeWindow_release     :: (window: *void) extern;
+ANativeWindow_getWidth    :: (window: *void) -> i32 extern;
+ANativeWindow_getHeight   :: (window: *void) -> i32 extern;
+ANativeWindow_setBuffersGeometry :: (w: *void, width: i32, height: i32, fmt: i32) -> i32 extern;
 
-AAssetManager_fromJava :: (env: *void, mgr: *void) -> *void #foreign;
+AAssetManager_fromJava :: (env: *void, mgr: *void) -> *void extern;
 
 // pthread (link libpthread is built into bionic).
-pthread_create  :: (thread: *u64, attr: *void, start: (*void) -> *void callconv(.c), arg: *void) -> i32 #foreign;
-pthread_mutex_init    :: (m: *void, attr: *void) -> i32 #foreign;
-pthread_mutex_lock    :: (m: *void) -> i32 #foreign;
-pthread_mutex_unlock  :: (m: *void) -> i32 #foreign;
+pthread_create  :: (thread: *u64, attr: *void, start: (*void) -> *void callconv(.c), arg: *void) -> i32 extern;
+pthread_mutex_init    :: (m: *void, attr: *void) -> i32 extern;
+pthread_mutex_lock    :: (m: *void) -> i32 extern;
+pthread_mutex_unlock  :: (m: *void) -> i32 extern;
 
 // EGL. Constants from <EGL/egl.h>. We bring up an ES3 context with a
 // 24-bit RGB framebuffer + 24-bit depth (same shape chess used under
@@ -112,17 +112,17 @@ EGL_WINDOW_BIT         :i32: 0x0004;
 EGL_NATIVE_VISUAL_ID   :i32: 0x302E;
 EGL_CONTEXT_CLIENT_VERSION :i32: 0x3098;
 
-eglGetDisplay          :: (id: u64) -> *void #foreign;
-eglInitialize          :: (d: *void, major: *i32, minor: *i32) -> u32 #foreign;
-eglChooseConfig        :: (d: *void, attrs: *i32, configs: **void, sz: i32, num: *i32) -> u32 #foreign;
-eglGetConfigAttrib     :: (d: *void, cfg: *void, attr: i32, value: *i32) -> u32 #foreign;
-eglCreateContext       :: (d: *void, cfg: *void, share: *void, attrs: *i32) -> *void #foreign;
-eglCreateWindowSurface :: (d: *void, cfg: *void, window: *void, attrs: *i32) -> *void #foreign;
-eglMakeCurrent         :: (d: *void, draw: *void, read: *void, ctx: *void) -> u32 #foreign;
-eglSwapBuffers         :: (d: *void, surface: *void) -> u32 #foreign;
-eglDestroyContext      :: (d: *void, ctx: *void) -> u32 #foreign;
-eglDestroySurface      :: (d: *void, surface: *void) -> u32 #foreign;
-eglTerminate           :: (d: *void) -> u32 #foreign;
+eglGetDisplay          :: (id: u64) -> *void extern;
+eglInitialize          :: (d: *void, major: *i32, minor: *i32) -> u32 extern;
+eglChooseConfig        :: (d: *void, attrs: *i32, configs: **void, sz: i32, num: *i32) -> u32 extern;
+eglGetConfigAttrib     :: (d: *void, cfg: *void, attr: i32, value: *i32) -> u32 extern;
+eglCreateContext       :: (d: *void, cfg: *void, share: *void, attrs: *i32) -> *void extern;
+eglCreateWindowSurface :: (d: *void, cfg: *void, window: *void, attrs: *i32) -> *void extern;
+eglMakeCurrent         :: (d: *void, draw: *void, read: *void, ctx: *void) -> u32 extern;
+eglSwapBuffers         :: (d: *void, surface: *void) -> u32 extern;
+eglDestroyContext      :: (d: *void, ctx: *void) -> u32 extern;
+eglDestroySurface      :: (d: *void, surface: *void) -> u32 extern;
+eglTerminate           :: (d: *void) -> u32 extern;
 
 // ── Touch ring ──────────────────────────────────────────────────────────
 
diff --git a/library/modules/platform/android_jni.sx b/library/modules/platform/android_jni.sx
index 2e9a26b..2f4ea5b 100644
--- a/library/modules/platform/android_jni.sx
+++ b/library/modules/platform/android_jni.sx
@@ -11,21 +11,21 @@
 // signatures (`getWindow :: (self: *Self) -> *Window`) still resolve
 // against the bare name within the namespace.
 
-WindowInsets :: #foreign #jni_class("android/view/WindowInsets") {
+WindowInsets :: #jni_class("android/view/WindowInsets") extern {
     getSystemWindowInsetTop    :: (self: *Self) -> i32;
     getSystemWindowInsetLeft   :: (self: *Self) -> i32;
     getSystemWindowInsetBottom :: (self: *Self) -> i32;
     getSystemWindowInsetRight  :: (self: *Self) -> i32;
 }
 
-View :: #foreign #jni_class("android/view/View") {
+View :: #jni_class("android/view/View") extern {
     getRootWindowInsets :: (self: *Self) -> *WindowInsets;
 }
 
-Window :: #foreign #jni_class("android/view/Window") {
+Window :: #jni_class("android/view/Window") extern {
     getDecorView :: (self: *Self) -> *View;
 }
 
-Activity :: #foreign #jni_class("android/app/Activity") {
+Activity :: #jni_class("android/app/Activity") extern {
     getWindow :: (self: *Self) -> *Window;
 }
diff --git a/library/modules/platform/sdl3.sx b/library/modules/platform/sdl3.sx
index 35258c8..5dd0631 100644
--- a/library/modules/platform/sdl3.sx
+++ b/library/modules/platform/sdl3.sx
@@ -11,8 +11,8 @@
 
 g_sdl_plat : *SdlPlatform = null;
 
-chdir :: (path: [*]u8) -> i32 #foreign;
-SDL_GetBasePath :: () -> [*]u8 #foreign;
+chdir :: (path: [*]u8) -> i32 extern;
+SDL_GetBasePath :: () -> [*]u8 extern;
 
 // A macOS `.app` launched via Finder / `open` starts with CWD=`/`, so a
 // game's CWD-relative asset loads (`read_file_bytes("assets/...")`) miss and
diff --git a/library/modules/platform/uikit.sx b/library/modules/platform/uikit.sx
index bdbac23..bd1900d 100644
--- a/library/modules/platform/uikit.sx
+++ b/library/modules/platform/uikit.sx
@@ -15,14 +15,14 @@
 #import "modules/platform/types.sx";
 #import "modules/platform/api.sx";
 
-UIApplicationMain :: (argc: i32, argv: *void, principal_class: *NSString, delegate_class: *NSString) -> i32 #foreign;
-dlsym             :: (handle: *void, name: [*]u8) -> *void #foreign;
-chdir             :: (path: [*]u8) -> i32 #foreign;
+UIApplicationMain :: (argc: i32, argv: *void, principal_class: *NSString, delegate_class: *NSString) -> i32 extern;
+dlsym             :: (handle: *void, name: [*]u8) -> *void extern;
+chdir             :: (path: [*]u8) -> i32 extern;
 
 // QuartzCore's wall-clock helper used by CoreAnimation. Seconds since boot,
 // monotonic. We use it as the timebase for keyboard-inset lockstep so the
 // per-frame interpolation lines up with UIKit's own animation timestamp.
-CACurrentMediaTime :: () -> f64 #foreign;
+CACurrentMediaTime :: () -> f64 extern;
 
 
 // kEAGLRenderingAPIOpenGLES3 = 3
@@ -58,13 +58,13 @@ CGRect :: struct {
 // side name maps to its Obj-C selector via the default mangling rule
 // (split on `_`; each piece becomes a keyword with `:`).
 
-NSValue :: #foreign #objc_class("NSValue") {
+NSValue :: #objc_class("NSValue") extern {
     #extends NSObject;
     // CGRect unboxing — returns by value via the sret/HFA path.
     CGRectValue :: (self: *Self) -> CGRect;
 }
 
-NSNumber :: #foreign #objc_class("NSNumber") {
+NSNumber :: #objc_class("NSNumber") extern {
     #extends NSObject;
     // Class method (no `self: *Self` first param → static dispatch).
     numberWithBool :: (b: i8) -> *NSNumber;
@@ -73,36 +73,36 @@ NSNumber :: #foreign #objc_class("NSNumber") {
     unsignedLongValue  :: (self: *Self) -> u64;
 }
 
-NSDictionary :: #foreign #objc_class("NSDictionary") {
+NSDictionary :: #objc_class("NSDictionary") extern {
     #extends NSObject;
     objectForKey :: (self: *Self, key: *NSString) -> *void;
 }
 
-NSMutableDictionary :: #foreign #objc_class("NSMutableDictionary") {
+NSMutableDictionary :: #objc_class("NSMutableDictionary") extern {
     #extends NSDictionary;
     dictionary         :: () -> *NSMutableDictionary;
     setObject_forKey   :: (self: *Self, obj: *void, key: *void);
 }
 
-NSSet :: #foreign #objc_class("NSSet") {
+NSSet :: #objc_class("NSSet") extern {
     #extends NSObject;
     anyObject :: (self: *Self) -> *void;
 }
 
 // ── Notifications + Bundle (Phase 3.2 C2) ──────────────────────────────
 
-NSNotification :: #foreign #objc_class("NSNotification") {
+NSNotification :: #objc_class("NSNotification") extern {
     #extends NSObject;
     userInfo :: (self: *Self) -> *NSDictionary;
 }
 
-NSBundle :: #foreign #objc_class("NSBundle") {
+NSBundle :: #objc_class("NSBundle") extern {
     #extends NSObject;
     mainBundle   :: () -> *NSBundle;
     resourcePath :: (self: *Self) -> *NSString;
 }
 
-NSNotificationCenter :: #foreign #objc_class("NSNotificationCenter") {
+NSNotificationCenter :: #objc_class("NSNotificationCenter") extern {
     #extends NSObject;
     defaultCenter :: () -> *NSNotificationCenter;
     addObserver_selector_name_object :: (self: *Self, observer: *void, sel: *void, name: *NSString, obj: *void);
@@ -110,12 +110,12 @@ NSNotificationCenter :: #foreign #objc_class("NSNotificationCenter") {
 
 // ── RunLoop + display timing (Phase 3.2 C3) ────────────────────────────
 
-NSRunLoop :: #foreign #objc_class("NSRunLoop") {
+NSRunLoop :: #objc_class("NSRunLoop") extern {
     #extends NSObject;
     currentRunLoop :: () -> *NSRunLoop;
 }
 
-CADisplayLink :: #foreign #objc_class("CADisplayLink") {
+CADisplayLink :: #objc_class("CADisplayLink") extern {
     #extends NSObject;
     displayLinkWithTarget_selector :: (target: *void, sel: *void) -> *CADisplayLink;
     addToRunLoop_forMode :: (self: *Self, runloop: *NSRunLoop, mode: *NSString);
@@ -126,23 +126,23 @@ CADisplayLink :: #foreign #objc_class("CADisplayLink") {
 // ── View tree + GL drawables (Phase 3.2 C5) ────────────────────────────
 // (Declared before UIView so `layer :: (...) -> *CALayer` can reference it.)
 
-CALayer :: #foreign #objc_class("CALayer") {
+CALayer :: #objc_class("CALayer") extern {
     #extends NSObject;
     setOpaque :: (self: *Self, opaque: i8);
 }
 
-CAEAGLLayer :: #foreign #objc_class("CAEAGLLayer") {
+CAEAGLLayer :: #objc_class("CAEAGLLayer") extern {
     #extends CALayer;
     class :: () -> *void;
     setDrawableProperties :: (self: *Self, props: *void);
 }
 
-CAMetalLayer :: #foreign #objc_class("CAMetalLayer") {
+CAMetalLayer :: #objc_class("CAMetalLayer") extern {
     #extends CALayer;
     class :: () -> *void;
 }
 
-EAGLContext :: #foreign #objc_class("EAGLContext") {
+EAGLContext :: #objc_class("EAGLContext") extern {
     #extends NSObject;
     alloc                            :: () -> *EAGLContext;
     initWithAPI                      :: (self: *Self, api: i32) -> *EAGLContext;
@@ -153,7 +153,7 @@ EAGLContext :: #foreign #objc_class("EAGLContext") {
 
 // ── UIKit chrome (Phase 3.2 C4) ────────────────────────────────────────
 
-UIScreen :: #foreign #objc_class("UIScreen") {
+UIScreen :: #objc_class("UIScreen") extern {
     #extends NSObject;
     mainScreen  :: () -> *UIScreen;
     nativeScale :: (self: *Self) -> f64;
@@ -164,13 +164,13 @@ UIScreen :: #foreign #objc_class("UIScreen") {
 // Most UIKit classes inherit from it; sx-defined classes that
 // participate in lifecycle callbacks (delegates, scene delegates)
 // extend it so the runtime picks up the responder-chain behavior.
-UIResponder :: #foreign #objc_class("UIResponder") {
+UIResponder :: #objc_class("UIResponder") extern {
     #extends NSObject;
     becomeFirstResponder :: (self: *Self) -> i8;
     resignFirstResponder :: (self: *Self) -> i8;
 }
 
-UIView :: #foreign #objc_class("UIView") {
+UIView :: #objc_class("UIView") extern {
     #extends UIResponder;
     safeAreaInsets        :: (self: *Self) -> UIEdgeInsets;
     addSubview            :: (self: *Self, view: *void);
@@ -178,7 +178,7 @@ UIView :: #foreign #objc_class("UIView") {
     setContentScaleFactor :: (self: *Self, scale: f64);
 }
 
-UIWindow :: #foreign #objc_class("UIWindow") {
+UIWindow :: #objc_class("UIWindow") extern {
     #extends UIView;
     alloc                  :: () -> *UIWindow;
     initWithWindowScene    :: (self: *Self, scene: *void) -> *UIWindow;
@@ -187,14 +187,14 @@ UIWindow :: #foreign #objc_class("UIWindow") {
     screen                 :: (self: *Self) -> *UIScreen;
 }
 
-UIViewController :: #foreign #objc_class("UIViewController") {
+UIViewController :: #objc_class("UIViewController") extern {
     #extends UIResponder;
     alloc   :: () -> *UIViewController;
     init    :: (self: *Self) -> *UIViewController;
     setView :: (self: *Self, view: *void);
 }
 
-UITextField :: #foreign #objc_class("UITextField") {
+UITextField :: #objc_class("UITextField") extern {
     #extends UIResponder;
     alloc :: () -> *UITextField;
     init  :: (self: *Self) -> *UITextField;
@@ -203,7 +203,7 @@ UITextField :: #foreign #objc_class("UITextField") {
 // SxAppDelegate — UIApplicationMain's delegate class (the app delegate, a
 // UIResponder — NOT the UIApplication principal class). Method bodies
 // dispatch to UIKitPlatform methods on the shared `g_uikit_plat`.
-SxAppDelegate :: #objc_class("SxAppDelegate") {
+SxAppDelegate :: #objc_class("SxAppDelegate") export {
     #extends UIResponder;
 
     application_didFinishLaunchingWithOptions :: (self: *Self, app: *void, opts: *void) -> BOOL {
@@ -233,7 +233,7 @@ SxAppDelegate :: #objc_class("SxAppDelegate") {
 // SxSceneDelegate — iOS 13+ scene-based lifecycle delegate. Two
 // `#implements` declarations formally conform to the scene-delegate
 // protocols — iOS rejects the class otherwise.
-SxSceneDelegate :: #objc_class("SxSceneDelegate") {
+SxSceneDelegate :: #objc_class("SxSceneDelegate") export {
     #extends UIResponder;
     #implements UISceneDelegate;
     #implements UIWindowSceneDelegate;
@@ -827,7 +827,7 @@ uikit_chdir_to_bundle :: () {
 // M3.3 — migrated to declarative `#objc_class` form. The compiler
 // synthesises class-pair init, metaclass `+layerClass`, and the
 // instance-method IMP trampolines at module init.
-SxGLView :: #objc_class("SxGLView") {
+SxGLView :: #objc_class("SxGLView") export {
     #extends UIView;
 
     layerClass :: () => CAEAGLLayer.class();
@@ -886,7 +886,7 @@ uikit_first_touch :: (touches: *void) -> *void {
 //
 // M3.4 — migrated to declarative `#objc_class`. Only `+layerClass`
 // differs from SxGLView (returns CAMetalLayer instead of CAEAGLLayer).
-SxMetalView :: #objc_class("SxMetalView") {
+SxMetalView :: #objc_class("SxMetalView") export {
     #extends UIView;
 
     layerClass :: () => CAMetalLayer.class();