diff --git a/eventcomm.c b/eventcomm.c
index 6f6de7f..3ea415b 100644
--- a/eventcomm.c
+++ b/eventcomm.c
@@ -21,6 +21,10 @@ #include "eventcomm.h"
 #include "synproto.h"
 #include "synaptics.h"
 #include <xf86.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
 
 
 #define SYSCALL(call) while (((call) == -1) && (errno == EINTR))
diff --git a/ps2comm.h b/ps2comm.h
index d6f0a25..4a1a051 100644
--- a/ps2comm.h
+++ b/ps2comm.h
@@ -1,6 +1,7 @@
 #ifndef _PS2COMM_H_
 #define _PS2COMM_H_
 
+#include <unistd.h>
 #include <sys/ioctl.h>
 #include "xf86_OSproc.h"
 
diff --git a/psmcomm.c b/psmcomm.c
index e4df42b..9865832 100644
--- a/psmcomm.c
+++ b/psmcomm.c
@@ -33,6 +33,7 @@ #include "synproto.h"
 #include "synaptics.h"
 #include "ps2comm.h"			    /* ps2_print_ident() */
 #include <xf86.h>
+#include <errno.h>
 
 #define SYSCALL(call) while (((call) == -1) && (errno == EINTR))
 
diff --git a/psmcomm.h b/psmcomm.h
index 6d64df6..a3162a2 100644
--- a/psmcomm.h
+++ b/psmcomm.h
@@ -1,6 +1,7 @@
 #ifndef _PSMCOMM_H_
 #define _PSMCOMM_H_
 
+#include <unistd.h>
 #include <sys/ioctl.h>
 #include "freebsd_mouse.h"
 
diff --git a/synaptics.c b/synaptics.c
index 2a17f81..63edebb 100644
--- a/synaptics.c
+++ b/synaptics.c
@@ -59,6 +59,7 @@
  *	Standard Headers
  ****************************************************************************/
 
+#include <unistd.h>
 #include <sys/ioctl.h>
 #include <misc.h>
 #include <xf86.h>
diff --git a/synproto.h b/synproto.h
index 8562a75..ecc4357 100644
--- a/synproto.h
+++ b/synproto.h
@@ -19,6 +19,7 @@
 #ifndef _SYNPROTO_H_
 #define _SYNPROTO_H_
 
+#include <unistd.h>
 #include <sys/ioctl.h>
 #include <xf86Xinput.h>
 #include <xisb.h>