--- src/tools/ATVersion.cpp.old 2014-05-07 20:57:07.086894124 +0200 +++ src/tools/ATVersion.cpp 2014-05-07 20:57:32.906640035 +0200 @@ -40,6 +40,7 @@ #include <cerrno> #include <fstream> #include <dirent.h> +#include <unistd.h> #define AT_VERSION_ARGUMENT "--version" #define AT_VERSION_MAXSIZE 40