diff --git a/common/rfb/pam.h b/common/rfb/pam.h
new file mode 100644
index 0000000..2688f21
--- /dev/null
+++ b/common/rfb/pam.h
@@ -0,0 +1,42 @@
+/* 
+ * Copyright (C) 2006 Martin Koegler
+ * Copyright (C) 2010 TigerVNC Team
+ *    
+ * This is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * 
+ * This software is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this software; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
+ * USA.
+ */
+
+#ifndef __RFB_PAM_H__
+#define __RFB_PAM_H__
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#ifndef HAVE_PAM
+#error "This header should not be included when PAM is unsupported"
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int do_pam_auth(const char *service, const char *username, const char *password);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif