diff --git a/include/signal.h b/include/signal.h
index f90d9dcf7..9754c06bb 100755
--- a/include/signal.h
+++ b/include/signal.h
@@ -108,6 +108,7 @@ _PROTOTYPE( __sighandler_t signal, (int _sig, __sighandler_t _func)	);
 
 #ifdef _POSIX_SOURCE
 _PROTOTYPE( int kill, (pid_t _pid, int _sig)				);
+_PROTOTYPE( int killpg, (pid_t _pgrp, int _sig)				);
 _PROTOTYPE( int sigaction,
     (int _sig, const struct sigaction *_act, struct sigaction *_oact)	);
 _PROTOTYPE( int sigaddset, (sigset_t *_set, int _sig)			);
diff --git a/include/stdlib.h b/include/stdlib.h
index 8797e3b9c..d170623ee 100755
--- a/include/stdlib.h
+++ b/include/stdlib.h
@@ -71,12 +71,14 @@ _PROTOTYPE( char *initstate, (unsigned _seed, char *_state,
 _PROTOTYPE( long random, (void)						);
 _PROTOTYPE( char *setstate, (const char *state)				);
 _PROTOTYPE( void srandom, (unsigned seed)				);
-_PROTOTYPE( int getloadavg, (double *, int)				);
+_PROTOTYPE( int putenv, (char *string)					);
+_PROTOTYPE( int setenv, (const char *envname, const char *envval,
+							int overwrite)	);
+_PROTOTYPE( int unsetenv, (const char *name)				);
 #endif
 
 #ifdef _MINIX
-_PROTOTYPE( int putenv, (const char *_name)				);
-_PROTOTYPE( int setenv, (const char *name, const char *val, const int f));
+_PROTOTYPE( int getloadavg, (double *, int)				);
 
 /* According to POSIX, getopt should be in unistd.h. What do we do with
  * this?
diff --git a/include/unistd.h b/include/unistd.h
index 4ae87ead4..1f1f89eca 100755
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -158,6 +158,9 @@ _PROTOTYPE( int usleep, (useconds_t _useconds)				);
 #ifndef _TYPE_H
 #include <minix/type.h>
 #endif
+
+extern int optreset;	/* Reset getopt state */
+
 _PROTOTYPE( int brk, (char *_addr)					);
 _PROTOTYPE( int chroot, (const char *_name)				);
 _PROTOTYPE( int mknod, (const char *_name, _mnx_Mode_t _mode, Dev_t _addr)	);