Bail if not actually SDL 1.2.6.

stepmania/src/StepMania.cpp

@@ -484,6 +484,19 @@ RageDisplay *CreateDisplay()
 	RageException::Throw( error );
 }
 
+static void CheckSDLVersion( int major, int minor, int patch )
+{
+	const SDL_version *ver = SDL_Linked_Version();
+	if( ver->major > major ||
+	   (ver->major == major && ver->minor > minor) ||
+	   (ver->major == major && ver->minor == minor && ver->patch >= patch))
+		return;
+
+	RageException::Throw( "SDL %i.%i.%i is required, but you only appear to "
+		"have SDL %i.%i.%i installed.  Please upgrade your installation of SDL or download "
+		"it from:\n\n\thttp://www.libsdl.org/",
+		major, minor, patch, ver->major, ver->minor, ver->patch );
+}
 
 static void RestoreAppPri()
 {
@@ -546,6 +559,8 @@ int main(int argc, char* argv[])
 	if( PREFSMAN->m_bShowLogWindow )
 		LOG->ShowConsole();
 
+	CheckSDLVersion( 1,2,6 );
+	
 	/* This should be done after PREFSMAN is set up, so it can use HOOKS->MessageBoxOK,
 	 * but before we do more complex things that might crash. */
 	HOOKS->DumpDebugInfo();