--- proc/devname.c
+++ proc/devname.c	2012-06-01 13:35:43.452010553 +0000
@@ -53,6 +53,10 @@
 #define minor <-- do not use -->
 #endif
 
+#ifndef PAGE_SIZE
+# define PAGE_SIZE	(sysconf(_SC_PAGESIZE))
+#endif
+
 typedef struct tty_map_node {
   struct tty_map_node *next;
   unsigned short devfs_type;  // bool