Index: head/sys/sys/exec.h
===================================================================
--- head/sys/sys/exec.h
+++ head/sys/sys/exec.h
@@ -77,7 +77,6 @@
  * Prefer the kern.ps_strings or kern.proc.ps_strings sysctls to this constant.
  */
 #define	PS_STRINGS	(USRSTACK - sizeof(struct ps_strings))
-#define	SPARE_USRSPACE	4096
 
 int exec_map_first_page(struct image_params *);        
 void exec_unmap_first_page(struct image_params *);