diff --git a/BasiliskII/src/CrossPlatform/vm_alloc.h b/BasiliskII/src/CrossPlatform/vm_alloc.h
index bc5aba97..9f9d28bb 100644
--- a/BasiliskII/src/CrossPlatform/vm_alloc.h
+++ b/BasiliskII/src/CrossPlatform/vm_alloc.h
@@ -101,6 +101,8 @@ extern void * vm_acquire(size_t size, int options = VM_MAP_DEFAULT);
 
 extern void * vm_acquire_reserved(size_t size);
 
+extern int vm_init_reserved(void * host_address);
+
 /* Allocate zero-filled memory at exactly ADDR (which must be page-aligned).
    Returns 0 if successful, -1 on errors.  */
 
diff --git a/BasiliskII/src/MacOSX/utils_macosx.h b/BasiliskII/src/MacOSX/utils_macosx.h
index 0b7bb0c8..e37d687c 100644
--- a/BasiliskII/src/MacOSX/utils_macosx.h
+++ b/BasiliskII/src/MacOSX/utils_macosx.h
@@ -24,6 +24,17 @@
 // Invokes the specified function with an NSAutoReleasePool in place.
 void NSAutoReleasePool_wrap(void (*fn)(void));
 
+#ifdef USE_SDL
+#if SDL_VERSION_ATLEAST(2,0,0)
+void disable_SDL2_macosx_menu_bar_keyboard_shortcuts();
+bool is_fullscreen_osx(SDL_Window * window);
+#endif
+#endif
+
+void set_menu_bar_visible_osx(bool visible);
+
+void set_current_directory();
+
 bool MetalIsAvailable();
 
 #endif
diff --git a/BasiliskII/src/MacOSX/utils_macosx.mm b/BasiliskII/src/MacOSX/utils_macosx.mm
index 9dbcff69..3c61bfe8 100644
--- a/BasiliskII/src/MacOSX/utils_macosx.mm
+++ b/BasiliskII/src/MacOSX/utils_macosx.mm
@@ -20,8 +20,8 @@
 
 #include <Cocoa/Cocoa.h>
 #include "sysdeps.h"
-#include "utils_macosx.h"
 #include <SDL.h>
+#include "utils_macosx.h"
 
 #if SDL_VERSION_ATLEAST(2,0,0)
 #include <SDL_syswm.h>
diff --git a/BasiliskII/src/SDL/video_sdl2.cpp b/BasiliskII/src/SDL/video_sdl2.cpp
index 27a52e2f..907b9175 100644
--- a/BasiliskII/src/SDL/video_sdl2.cpp
+++ b/BasiliskII/src/SDL/video_sdl2.cpp
@@ -1718,7 +1718,6 @@ static bool is_fullscreen(SDL_Window * window)
 	// involves fullscreen/windowed toggles via window-manager UI controls).
 	// Until it does, or adds a facility to do so, we'll use a platform-specific
 	// code path to detect fullscreen changes.
-	extern bool is_fullscreen_osx(SDL_Window * window);
 	return is_fullscreen_osx(sdl_window);
 #else
 	if (!window) {
@@ -2272,7 +2271,6 @@ static int SDLCALL on_sdl_event_generated(void *userdata, SDL_Event * event)
 						// cursor is near the top of the screen, lest the
 						// guest OS' menu bar be obscured.
 						if (is_full) {
-							extern void set_menu_bar_visible_osx(bool);
 							set_menu_bar_visible_osx(false);
 						}
 #endif
diff --git a/BasiliskII/src/Unix/main_unix.cpp b/BasiliskII/src/Unix/main_unix.cpp
index 7f4974fd..3706f7f9 100755
--- a/BasiliskII/src/Unix/main_unix.cpp
+++ b/BasiliskII/src/Unix/main_unix.cpp
@@ -43,6 +43,10 @@
 # include <sys/mman.h>
 #endif
 
+#if __MACOSX__
+# include "utils_macosx.h"
+#endif
+
 #if !EMULATED_68K && defined(__NetBSD__)
 # include <m68k/sync_icache.h> 
 # include <m68k/frame.h>
@@ -579,7 +583,6 @@ int main(int argc, char **argv)
 	//
 	// HACK: disable these shortcuts, while leaving all other pieces of SDL2's
 	// menu bar in-place.
-	extern void disable_SDL2_macosx_menu_bar_keyboard_shortcuts();
 	disable_SDL2_macosx_menu_bar_keyboard_shortcuts();
 #endif
 	
diff --git a/SheepShaver/src/Unix/main_unix.cpp b/SheepShaver/src/Unix/main_unix.cpp
index 35ee28f8..e1e24ae8 100755
--- a/SheepShaver/src/Unix/main_unix.cpp
+++ b/SheepShaver/src/Unix/main_unix.cpp
@@ -2217,8 +2217,6 @@ rti:;
 }
 #endif
 
-extern int vm_init_reserved(void *hostAddress);
-
 /*
  *  Helpers to share 32-bit addressable data with MacOS
  */