diff -up KNI_3.9.2/src/Base/cdlCOM.cpp.gcc47 KNI_3.9.2/src/Base/cdlCOM.cpp
--- KNI_3.9.2/src/Base/cdlCOM.cpp.gcc47	2012-03-08 11:25:45.466392402 -0500
+++ KNI_3.9.2/src/Base/cdlCOM.cpp	2012-03-08 11:25:54.399317676 -0500
@@ -26,6 +26,7 @@
 #include <cstdio>
 
 #include <cstdlib>
+#include <unistd.h>
 #ifdef WIN32
 
 CCdlCOM::CCdlCOM(TCdlCOMDesc ccd) : _deviceName(""), _ccd(), _prtHdl(INVALID_HANDLE_VALUE), _oto() {