--- ./pike/0.6/src/modules/Pipe/pipe.c.dist	Thu Oct 22 21:03:18 1998
+++ ./pike/0.6/src/modules/Pipe/pipe.c	Fri Jul 30 02:12:12 1999
@@ -704,6 +704,7 @@
 	 i->len=s.st_size;
 	 i->u.mmap=m;
 #ifdef HAVE_MADVISE
+#ifdef MADV_SEQUENTIAL
 	 /* Mark the pages as sequential read only access... */
 
 	 /* NOTE:
@@ -733,6 +734,7 @@
 #endif /* HAVE_SETRESUID */
 #endif /* HAVE_SETEUID */
 	 }
+#endif
 #endif
 #endif
 	 pop_n_elems(args);