Index: head/sys/sys/elf_common.h
===================================================================
--- head/sys/sys/elf_common.h
+++ head/sys/sys/elf_common.h
@@ -762,6 +762,9 @@
 #define	NT_FREEBSD_ARCH_TAG	3
 #define	NT_FREEBSD_FEATURE_CTL	4
 
+/* NT_FREEBSD_FEATURE_CTL desc[0] bits */
+#define	NT_FREEBSD_FCTL_ASLR_DISABLE	0x00000001
+
 /* Values for n_type.  Used in core files. */
 #define	NT_PRSTATUS	1	/* Process status. */
 #define	NT_FPREGSET	2	/* Floating point registers. */