diff --git a/mach/proto/ncg/compute.c b/mach/proto/ncg/compute.c
index d32417e68..7761976f8 100644
--- a/mach/proto/ncg/compute.c
+++ b/mach/proto/ncg/compute.c
@@ -14,6 +14,9 @@ static char rcsid[] = "$Id$";
 #include "result.h"
 #include "glosym.h"
 #include "extern.h"
+#ifdef REGVARS
+#include "regvar.h"
+#endif
 #ifdef USE_TES
 #include "label.h"
 #endif
diff --git a/mach/proto/ncg/fillem.c b/mach/proto/ncg/fillem.c
index 447faeb41..e2ad5028c 100644
--- a/mach/proto/ncg/fillem.c
+++ b/mach/proto/ncg/fillem.c
@@ -365,7 +365,6 @@ dopseudo() {
 		} else if (argval == ms_reg) {
 			long r_off;
 			int r_size,r_type,r_score;
-			struct regvar *linkreg();
 
 			if (!regallowed)
 				error("mes 3 not allowed here");
diff --git a/mach/proto/ncg/regvar.c b/mach/proto/ncg/regvar.c
index 934b775f8..f39134892 100644
--- a/mach/proto/ncg/regvar.c
+++ b/mach/proto/ncg/regvar.c
@@ -28,7 +28,7 @@ extern string myalloc();
 struct regvar *rvlist;
 
 struct regvar *
-linkreg(of,sz,tp,sc) long of; {
+linkreg(long of, int sz, int tp, int sc) {
 	register struct regvar *rvlp;
 
 	rvlp= (struct regvar *) myalloc(sizeof *rvlp);
@@ -43,7 +43,7 @@ linkreg(of,sz,tp,sc) long of; {
 }
 
 void
-tryreg(rvlp,typ) register struct regvar *rvlp; {
+tryreg(struct regvar *rvlp, int typ) {
 	int score;
 	register i;
 	register struct regassigned *ra;
@@ -100,7 +100,8 @@ tryreg(rvlp,typ) register struct regvar *rvlp; {
 	}
 }
 
-fixregvars(saveall) {
+void
+fixregvars(int saveall) {
 	register struct regvar *rv;
 	register rvtyp,i;
 	
@@ -141,7 +142,8 @@ fixregvars(saveall) {
 	f_regsave();
 }
 
-isregvar(off) long off; {
+int
+isregvar(long off) {
 	register struct regvar *rvlp;
 
 	for(rvlp=rvlist;rvlp!=0;rvlp=rvlp->rv_next)
@@ -150,7 +152,8 @@ isregvar(off) long off; {
 	return(-1);
 }
 
-isregtyp(off) long off; {
+int
+isregtyp(long off) {
 	register struct regvar *rvlp;
 
 	for(rvlp=rvlist;rvlp!=0;rvlp=rvlp->rv_next)
@@ -159,7 +162,8 @@ isregtyp(off) long off; {
 	return(-1);
 }
 
-unlinkregs() {
+void
+unlinkregs(void) {
 	register struct regvar *rvlp,*t;
 	register struct regassigned *ra;
 	int rvtyp,i;
diff --git a/mach/proto/ncg/regvar.h b/mach/proto/ncg/regvar.h
index e04350356..2a66ddc4d 100644
--- a/mach/proto/ncg/regvar.h
+++ b/mach/proto/ncg/regvar.h
@@ -21,3 +21,10 @@ struct regassigned {
 extern struct regvar *rvlist;
 extern int nregvar[];
 extern struct regassigned *regassigned[];
+
+struct regvar *linkreg(long, int, int, int);
+void tryreg(struct regvar *, int);
+void fixregvars(int);
+int isregvar(long);
+int isregtyp(long);
+void unlinkregs(void);
diff --git a/mach/proto/ncg/subr.c b/mach/proto/ncg/subr.c
index 69d4493be..0c14fa410 100644
--- a/mach/proto/ncg/subr.c
+++ b/mach/proto/ncg/subr.c
@@ -13,6 +13,9 @@ static char rcsid[] = "$Id$";
 #include "data.h"
 #include "result.h"
 #include "extern.h"
+#ifdef REGVARS
+#include "regvar.h"
+#endif
 
 /*
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.