diff --git a/src/libnazgul.h b/src/libnazgul.h
new file mode 100644
index 0000000..ef5a98a
--- /dev/null
+++ b/src/libnazgul.h
@@ -0,0 +1,8 @@
+#ifndef _LIBNAZGUL
+#define _LIBNAZGUL 1
+
+#include "nzg_global.h"
+#include "nzg_iface.h"
+#include "nzg_proto.h"
+
+#endif
diff --git a/src/nzg_iface.h b/src/nzg_iface.h
index a2f7665..ab20c61 100644
--- a/src/nzg_iface.h
+++ b/src/nzg_iface.h
@@ -6,6 +6,11 @@
 #define MSGSPACE_DEFAULT_MODE 0600
 
 typedef char * msgSpaceId;
+typedef char * msgSpaceListElemId;
+typedef char * msgSpacePoolDataId;
+typedef char * msgSpacePoolId;
+typedef char * msgSpaceQueueDataId;
+typedef char * msgSpaceQueueId;
 
 typedef struct MsgPool {
 
@@ -16,7 +21,6 @@ typedef struct MsgSpace {
 } msgSpace;
 
 
-typedef char * msgSpaceListElemId;
 
 typedef struct MsgSpaceListElem {
   void * id;
@@ -25,5 +29,6 @@ typedef struct MsgSpaceListElem {
   msgSpaceListElemId next;
 } * msgSpaceList, msgSpaceListElem;
 
+
 #endif
 /* */
diff --git a/src/nzg_proto.h b/src/nzg_proto.h
index 13eba55..2353ac9 100644
--- a/src/nzg_proto.h
+++ b/src/nzg_proto.h
@@ -1,3 +1,5 @@
+#ifndef _NZG_PROTO
+#define _NZG_PROTO 1
 
 char **msgSpaceIdList(void);
 
@@ -18,3 +20,4 @@ msgSpace *msgSpaceOpen(msgSpaceId spaceId);
 void msgSpaceDelete(msgSpaceId spaceId);
 msgSpaceId msgSp2nzgId(msgSpaceId spaceId);
 
+#endif