@@ -56,11 +56,16 @@
 # include <stdbool.h>
 # include <filesystem.h>
 #endif
 
 #ifdef OF_AMIGAOS
-# define __USE_INLINE__
+# ifdef OF_AMIGAOS4
+#  define __USE_INLINE__
+#  define __NOLIBBASE__
+#  define __NOGLOBALIFACE__
+# endif
+# include <proto/exec.h>
 # include <proto/dos.h>
 #endif
 
 #ifndef O_BINARY
 # define O_BINARY 0
@@ -76,10 +81,16 @@
 #endif
 
 #ifndef OF_AMIGAOS
 # define closeHandle(h) close(h)
 #else
+# ifdef OF_AMIGAOS4
+extern struct ExecIFace *IExec;
+static struct Library *DOSBase = NULL;
+static struct DOSIFace *IDOS = NULL;
+# endif
+
 struct of_file_handle {
 	of_file_handle_t previous, next;
 	BPTR handle;
 	bool append;
 } *firstHandle = NULL;
@@ -103,10 +114,18 @@
 OF_DESTRUCTOR()
 {
 	for (of_file_handle_t iter = firstHandle; iter != NULL;
 	    iter = iter->next)
 		Close(iter->handle);
+
+# ifdef OF_AMIGAOS4
+	if (IDOS != NULL)
+		DropInterface(IDOS);
+
+	if (DOSBase != NULL)
+		CloseLibrary(DOSBase);
+# endif
 }
 #endif
 
 #ifndef OF_AMIGAOS
 static int
@@ -177,10 +196,21 @@
 #ifdef OF_NINTENDO_DS
 	if (!nitroFSInit(NULL))
 		@throw [OFInitializationFailedException
 		    exceptionWithClass: self];
 #endif
+
+#ifdef OF_AMIGAOS4
+	if ((DOSBase = OpenLibrary("dos.library", 36)) == NULL)
+		@throw [OFInitializationFailedException
+		    exceptionWithClass: self];
+
+	if ((IDOS = (struct DOSIFace *)
+	    GetInterface(DOSBase, "main", 1, NULL)) == NULL)
+		@throw [OFInitializationFailedException
+		    exceptionWithClass: self];
+#endif
 }
 
 + (instancetype)fileWithPath: (OFString *)path
 			mode: (OFString *)mode
 {