diff -uNrBbwp qt5-fsarchiver/src/main.cc qt5-fsarchiver-new/src/main.cc
--- qt5-fsarchiver/src/main.cc	2016-05-14 07:23:12.000000000 +0000
+++ qt5-fsarchiver-new/src/main.cc	2016-05-14 07:28:16.607007012 +0000
@@ -23,6 +23,8 @@
 #ifdef HAVE_SYS_PARAM_H
   #include <sys/param.h>
 #endif
+
+#include <unistd.h>
 #include <QApplication>
 #include <QTextCodec>
 #include <QTranslator>