diff -Naur textroom-0.8.2.orig/library/sxfile/getusername.cpp textroom-0.8.2.new/library/sxfile/getusername.cpp
--- textroom-0.8.2.orig/library/sxfile/getusername.cpp	2011-01-15 19:50:03.000000000 +0100
+++ textroom-0.8.2.new/library/sxfile/getusername.cpp	2016-01-10 13:06:54.888870334 +0100
@@ -17,6 +17,7 @@
 */
 
 #include "getusername.h"
+#include <unistd.h>
 
 #ifdef Q_OS_UNIX
 #include <sys/types.h>