diff --git a/src/libCom/Makefile b/src/libCom/Makefile
index 00ef04639..1993f8b8b 100644
--- a/src/libCom/Makefile
+++ b/src/libCom/Makefile
@@ -124,6 +124,7 @@ INC += tsStamp.h
 INC += osiMutex.h
 INC += osiEvent.h
 INC += osiProcess.h
+INC += osiUnistd.h
 
 SRCS += osdSock.c
 SRCS += osiSock.c
diff --git a/src/libCom/osi/os/WIN32/osiUnistd.h b/src/libCom/osi/os/WIN32/osiUnistd.h
new file mode 100644
index 000000000..d0450fdec
--- /dev/null
+++ b/src/libCom/osi/os/WIN32/osiUnistd.h
@@ -0,0 +1,17 @@
+/*  
+ *  $Id$
+ *
+ *                              
+ *                    L O S  A L A M O S
+ *              Los Alamos National Laboratory
+ *               Los Alamos, New Mexico 87545
+ *                                  
+ *  Copyright, 1986, The Regents of the University of California.
+ *                                  
+ *           
+ *	Author Jeffrey O. Hill
+ *	johill@lanl.gov
+ *	505 665 1831
+ */
+
+#include <direct.h>
\ No newline at end of file
diff --git a/src/libCom/osi/os/posix/osiUnistd.h b/src/libCom/osi/os/posix/osiUnistd.h
new file mode 100644
index 000000000..34308126e
--- /dev/null
+++ b/src/libCom/osi/os/posix/osiUnistd.h
@@ -0,0 +1,17 @@
+/*  
+ *  $Id$
+ *
+ *                              
+ *                    L O S  A L A M O S
+ *              Los Alamos National Laboratory
+ *               Los Alamos, New Mexico 87545
+ *                                  
+ *  Copyright, 1986, The Regents of the University of California.
+ *                                  
+ *           
+ *	Author Jeffrey O. Hill
+ *	johill@lanl.gov
+ *	505 665 1831
+ */
+
+#include <unistd.h>
\ No newline at end of file