--- lms-8.0.0-7/src/tools/ATVersion.cpp	2011-06-29 04:45:54.000000000 -0500
+++ /tmp/ATVersion.cpp	2017-03-08 13:46:49.100021793 -0600
@@ -40,6 +40,7 @@
 #include <cerrno>
 #include <fstream>
 #include <dirent.h>
+#include <unistd.h>
 
 #define AT_VERSION_ARGUMENT "--version"
 #define AT_VERSION_MAXSIZE 40