diff --git a/appframework/sdlmgr.cpp b/appframework/sdlmgr.cpp
index 5d121805..7234f4d1 100644
--- a/appframework/sdlmgr.cpp
+++ b/appframework/sdlmgr.cpp
@@ -4,8 +4,10 @@
 //
 //=============================================================================//
 
+#ifdef USE_SDL
 #include "SDL.h"
 #include "SDL_opengl.h"
+#endif
 
 #include "appframework/ilaunchermgr.h"
 #include "inputsystem/ButtonCode.h"
@@ -66,7 +68,7 @@ that Apple unhelpfully clamps you to vsync in this scenario, which would
 explain the 60fps max.
 
 There are a few options:
-- SDL_WINDOW_FULLSCREEN mode will not use this new magic (only
+- SDL_WAINDOW_FULLSCREEN mode will not use this new magic (only
 SDL_WINDOW_FULLSCREEN_DESKTOP), but that brings other problems and I
 wouldn't recommend a drastic change like that.
 
diff --git a/engine/host.cpp b/engine/host.cpp
index 0ff16bb2..067f9ee8 100644
--- a/engine/host.cpp
+++ b/engine/host.cpp
@@ -127,8 +127,11 @@
 #endif
 #if defined( LINUX )
 #include <locale.h>
+
+#ifdef USE_SDL
 #include "SDL.h"
 #endif
+#endif
 
 #include "ixboxsystem.h"
 extern IXboxSystem *g_pXboxSystem;
diff --git a/tier0/assert_dialog.cpp b/tier0/assert_dialog.cpp
index 04325f62..89af64c1 100644
--- a/tier0/assert_dialog.cpp
+++ b/tier0/assert_dialog.cpp
@@ -23,7 +23,7 @@
 #include <dlfcn.h>
 #endif
 
-#if defined( LINUX ) || defined( USE_SDL )
+#if defined( USE_SDL )
 
 // We lazily load the SDL shared object, and only reference functions if it's
 // available, so this can be included on the dedicated server too.
@@ -357,7 +357,7 @@ DBG_INTERFACE void SetAllAssertsDisabled( bool bAssertsDisabled )
 	g_bAssertsEnabled = !bAssertsDisabled;
 }
 
-#if defined( LINUX ) || defined( USE_SDL )
+#if defined( USE_SDL )
 SDL_Window *g_SDLWindow = NULL;
 
 DBG_INTERFACE void SetAssertDialogParent( struct SDL_Window *window )
@@ -534,7 +534,7 @@ DBG_INTERFACE bool DoNewAssertDialog( const tchar *pFilename, int line, const tc
 		DialogBox( g_hTier0Instance, MAKEINTRESOURCE( IDD_ASSERT_DIALOG ), hParentWindow, AssertDialogProc );
 	}
 
-#elif defined( POSIX )
+#elif defined( POSIX ) && defined ( USE_SDL )
 	static FUNC_SDL_ShowMessageBox *pfnSDLShowMessageBox = NULL;
 	if( !pfnSDLShowMessageBox )
 	{