diff --git a/lang/pc/comp/chk_expr.c b/lang/pc/comp/chk_expr.c
index fc4ec77df..76bfdab77 100644
--- a/lang/pc/comp/chk_expr.c
+++ b/lang/pc/comp/chk_expr.c
@@ -9,6 +9,8 @@
 #include	<assert.h>
 #include	<em_arith.h>
 #include	<em_label.h>
+#include	<system.h>
+#include	<print.h>
 
 #include	"LLlex.h"
 #include	"Lpars.h"
@@ -24,6 +26,7 @@
 #include	"type.h"
 
 extern char *symbol2str();
+STATIC int ChkUnOper();
 
 STATIC
 Xerror(nd, mess)
@@ -728,7 +731,6 @@ ChkVarPar(nd, name)
 	*/
 	static char err_mes[80];
 	char *message = (char *) 0;
-	extern char *sprint();
 
 	if( !ChkVariable(nd) ) return 0;
 
diff --git a/lang/pc/comp/declar.g b/lang/pc/comp/declar.g
index fd10845af..5f3a21ab8 100644
--- a/lang/pc/comp/declar.g
+++ b/lang/pc/comp/declar.g
@@ -21,7 +21,6 @@
 #include	"type.h"
 #include	"dbsymtab.h"
 
-#define	offsetof(type, field)	(int) &(((type *)0)->field)
 #define	PC_BUFSIZ	(sizeof(struct file) - (int)((struct file *)0)->bufadr)
 
 int proclevel = 0;		/* nesting level of procedures */