_SCO_DS           178 maint/gnulib/lib/stdio-impl.h # if defined _SCO_DS || (defined __SCO_VERSION__ || defined __sysv5__)  /* OpenServer 5, OpenServer 6, UnixWare 7 */
_SCO_DS            28 maint/gnulib/tests/nap.h # if defined _SCO_DS || (defined __SCO_VERSION__ || defined __sysv5__)  /* OpenServer, UnixWare */