--- a/src/lisp/globals.c
+++ b/src/lisp/globals.c
@@ -28,8 +28,6 @@ lispobj *dynamic_1_space;
 unsigned dynamic_space_size;
 lispobj *control_stack;
 
-
-lispobj *control_stack_start;
 #if (defined(i386) || defined(__x86_64))
 lispobj *control_stack_end;
 #endif

--- a/src/lisp/globals.h
+++ b/src/lisp/globals.h
@@ -37,8 +37,6 @@ extern unsigned long binding_stack_size;
 extern unsigned long static_space_size;
 extern unsigned long control_stack_size;
 
-extern lispobj *control_stack_start;
-
 #if (defined(i386) || defined(__x86_64))
 extern lispobj *control_stack_end;
 #endif

--- a/src/lisp/os-common.c
+++ b/src/lisp/os-common.c
@@ -424,7 +424,7 @@ guard_zones(char **yellow_start, char **red_start)
      * control stack area.
      */
 
-    char *end = (char *) control_stack_start + control_stack_size;
+    char *end = (char *) control_stack + control_stack_size;
 
     *red_start = end - RED_ZONE_SIZE;
     *yellow_start = *red_start - YELLOW_ZONE_SIZE;

--- a/src/lisp/solaris-os.c
+++ b/src/lisp/solaris-os.c
@@ -436,7 +436,7 @@ static unsigned long *space_size[] = {
 #define HOLE_SIZE 0x2000
 
 void
-make_hole(int index)
+make_hole(int k)
 {
     os_vm_address_t hole;