diff --git a/libgloss/mn10300/_exit.c b/libgloss/mn10300/_exit.c
index ec51d4088..2b548e82e 100644
--- a/libgloss/mn10300/_exit.c
+++ b/libgloss/mn10300/_exit.c
@@ -18,7 +18,7 @@ static void _do_dtors()
 }
 
 
-void _exit (n)
+void _exit (int n)
 {
   /* Destructors should be done earlier because they need to be done before the
      files are closed, but here is better than nowhere (and this balances the
diff --git a/libgloss/mn10300/getpid.c b/libgloss/mn10300/getpid.c
index 20ab1866e..fea57daff 100644
--- a/libgloss/mn10300/getpid.c
+++ b/libgloss/mn10300/getpid.c
@@ -4,7 +4,8 @@
 #include "trap.h"
 
 
-_getpid (n)
+int
+_getpid (int n)
 {
   return 1;
 }
diff --git a/libgloss/mn10300/isatty.c b/libgloss/mn10300/isatty.c
index 7e63a8c7c..3d8eb1910 100644
--- a/libgloss/mn10300/isatty.c
+++ b/libgloss/mn10300/isatty.c
@@ -4,8 +4,8 @@
 #include "trap.h"
 
 
-_isatty (fd)
-     int fd;
+int
+_isatty (int fd)
 {
   return 1;
 }
diff --git a/libgloss/mn10300/kill.c b/libgloss/mn10300/kill.c
index 40afa6a2c..d63a2f82c 100644
--- a/libgloss/mn10300/kill.c
+++ b/libgloss/mn10300/kill.c
@@ -4,7 +4,8 @@
 #include "trap.h"
 
 
-_kill (n, m)
+int
+_kill (int n, int m)
 {
   return TRAP0 (SYS_exit, 0xdead, 0, 0);
 }
diff --git a/libgloss/mn10300/read.c b/libgloss/mn10300/read.c
index 31d24cce9..2f1878c06 100644
--- a/libgloss/mn10300/read.c
+++ b/libgloss/mn10300/read.c
@@ -4,6 +4,7 @@
 #include "trap.h"
 
 
+int
 _read (int file,
        char *ptr,
        size_t len)
diff --git a/libgloss/mn10300/sbrk.c b/libgloss/mn10300/sbrk.c
index 376fd3285..78945e77a 100644
--- a/libgloss/mn10300/sbrk.c
+++ b/libgloss/mn10300/sbrk.c
@@ -1,8 +1,11 @@
 #include <_ansi.h>
 #include <sys/types.h>
 #include <sys/stat.h>
+#include <stdlib.h>
 #include "trap.h"
 
+extern int _write (int, char *, size_t);
+
 
 caddr_t
 _sbrk (size_t incr)
diff --git a/libgloss/mn10300/test.c b/libgloss/mn10300/test.c
index 9ea873adf..a61dbb797 100644
--- a/libgloss/mn10300/test.c
+++ b/libgloss/mn10300/test.c
@@ -1,4 +1,6 @@
 #include <stdio.h>
+#include <unistd.h>
+#include <string.h>
 
 static void
 send_msg1 (void)