The following were assumed to be present by multiple libc
methods or networking commands:
+ _PATH_DEVNULL ==> /dev/null
+ SIZE_T_MAX ==> SIZE_MAX
+ O_EXLOCK ==> O_EXCL
If you define DISABLE_IPV6=yes to the config.inc, then the
rtems-bsd-config.h file will be modified accordingly and
the IPV6 kernel sources will not be built. This is easier
to manage and more correct than having a patch to do the same.