-# ifdef AC_SYS_LONG_FILENAMES
-# define PIPEFORMAT "pipe.%lu.%lu.%d"
-# define PIPEFORMATEXTEND (sizeof(long)*3*2+sizeof(int)*3+1)
-# else
-# define PIPEFORMAT "%lx.%lx.%x"
-# define PIPEFORMATEXTEND (sizeof(long)*2*2+sizeof(int)*2+1)
-# endif
+# define PIPEFORMAT "%lx.%lx.%x"
+# define PIPEPATTERN "[0-9a-f]*.[0-9a-f]*.*[0-9a-f]"
+# define PIPEFORMATEXTEND ((int)(sizeof(unsigned long)*2*2+(int)sizeof(int)*2+3))
+# define PIPEMAXLEN ((int)(sizeof(PIPEFORMAT)+PIPEFORMATEXTEND))