Index: src/runtime/amiga-library.m
==================================================================
--- src/runtime/amiga-library.m
+++ src/runtime/amiga-library.m
@@ -586,10 +586,16 @@
 _Unwind_Resume(void *ex)
 {
 	libc._Unwind_Resume(ex);
 }
 #endif
+
+int *
+objc_get_errno(void)
+{
+	return libc.get_errno();
+}
 
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wpedantic"
 static CONST_APTR functionTable[] = {
 #ifdef OF_MORPHOS

Index: src/runtime/linklib/linklib.m
==================================================================
--- src/runtime/linklib/linklib.m
+++ src/runtime/linklib/linklib.m
@@ -25,10 +25,11 @@
 
 struct ObjFWRTBase;
 
 #import "inline.h"
 
+#include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
 
 #if defined(OF_AMIGAOS_M68K)
 # include <stabs.h>
@@ -60,10 +61,16 @@
 extern void __register_frame_info(const void *, void *);
 extern void *__deregister_frame_info(const void *);
 
 struct Library *ObjFWRTBase;
 void *__objc_class_name_Protocol;
+
+static int *
+get_errno(void)
+{
+	return &errno;
+}
 
 static void __attribute__((__used__))
 ctor(void)
 {
 	static bool initialized = false;
@@ -95,10 +102,11 @@
 #else
 		._Unwind_Resume = _Unwind_Resume,
 #endif
 		.__register_frame_info = __register_frame_info,
 		.__deregister_frame_info = __deregister_frame_info,
+		.get_errno = get_errno,
 	};
 
 	if (initialized)
 		return;
 

Index: src/runtime/private.h
==================================================================
--- src/runtime/private.h
+++ src/runtime/private.h
@@ -249,10 +249,11 @@
 	void (*_Nonnull _Unwind_Resume)(void *_Nonnull);
 # endif
 	void (*_Nonnull __register_frame_info)(const void *_Nonnull,
 	    void *_Nonnull);
 	void *(*_Nonnull __deregister_frame_info)(const void *_Nonnull);
+	int *_Nonnull (*_Nonnull get_errno)(void);
 };
 #endif
 
 #ifdef OBJC_COMPILING_AMIGA_LIBRARY
 # if defined(__MORPHOS__)
@@ -263,11 +264,14 @@
 	register type reg_##name __asm__(#reg);	\
 	type name = reg_##name;
 # endif
 # undef stdout
 # undef stderr
-extern FILE *stdout, *stderr;
+# undef errno
+extern FILE *_Nonnull stdout, *_Nonnull stderr;
+extern int *_Nonnull objc_get_errno(void);
+# define errno (*objc_get_errno())
 #endif
 
 extern void objc_register_all_categories(struct objc_symtab *_Nonnull);
 extern struct objc_category *_Nullable *_Nullable
     objc_categories_for_class(Class _Nonnull);