diff --git a/common/include/common/debug.h b/common/include/common/debug.h
index ad199bc9..94abcfed 100644
--- a/common/include/common/debug.h
+++ b/common/include/common/debug.h
@@ -18,6 +18,7 @@ Place, Suite 330, Boston, MA 02111-1307 USA
 */
 
 #include <stdio.h>
+#include <stdlib.h>
 
 #if defined(_WIN32) && !defined(__GNUC__)
   #define DIRECTORY_SEPARATOR '\\'
diff --git a/porthole/include/porthole/types.h b/porthole/include/porthole/types.h
new file mode 100644
index 00000000..0abca45a
--- /dev/null
+++ b/porthole/include/porthole/types.h
@@ -0,0 +1,37 @@
+/*
+Looking Glass - KVM FrameRelay (KVMFR) Client
+Copyright (C) 2017-2019 Geoffrey McRae <geoff@hostfission.com>
+https://looking-glass.hostfission.com
+
+This program 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 program 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 program; if not, write to the Free Software Foundation, Inc., 59 Temple
+Place, Suite 330, Boston, MA 02111-1307 USA
+*/
+
+#include <stdbool.h>
+#include <stdint.h>
+
+typedef struct
+{
+  unsigned int   size;
+  void         * data;
+}
+PortholeSegment;
+
+typedef struct
+{
+  uint32_t        id;
+  unsigned int    size;
+  unsigned int    num_segments;
+  PortholeSegment segments[0];
+}
+PortholeMap;
\ No newline at end of file