diff --git a/src/include/lib.h b/src/include/lib.h
index ea09887..b2f38a8 100644
--- a/src/include/lib.h
+++ b/src/include/lib.h
@@ -21,7 +21,7 @@
 
 #ifndef __LIB_H__
 #define __LIB_H__
-
+#include <stdint.h>
 #ifndef __ROMCC__ /* romcc doesn't support prototypes. */
 
 #ifndef __PRE_RAM__ /* Conflicts with romcc_io.h */
@@ -40,6 +40,12 @@
 int ram_check_nodie(unsigned long start, unsigned long stop);
 void quick_ram_check(void);
 
+/* Defined in src/lib/stack.c */
+int checkstack(void *top_of_stack, int stacksize);
+
+/* currently defined by a ldscript */
+extern u8 _estack;
+
 /* Defined in romstage.c */
 #if CONFIG_CPU_AMD_GEODE_LX
 void cache_as_ram_main(void);