diff -ruN valknut-0.4.9-orig/valknut/main.cpp valknut-0.4.9/valknut/main.cpp
--- valknut-0.4.9-orig/valknut/main.cpp	2009-01-17 12:01:25.000000000 -0600
+++ valknut-0.4.9/valknut/main.cpp	2014-08-10 07:25:59.000000000 -0500
@@ -25,6 +25,9 @@
 #ifndef WIN32
 #include <signal.h>
 #endif
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
 
 #include <qapplication.h>
 #include <qfont.h>