This is what semctl(2) seems to specify, anyway. This makes util-linux-2.8b fail its build. Andries.Brouwer@cwi.nl told me <sys/sem_buf.h> (which contains the definition) is not mentioned by either SYSV or X/OPEN. -- Horst von Brand vonbrand@sleipnir.valparaiso.cl Casilla 9G, Viña del Mar, Chile +56 32 672616