diff --git a/mach/minix/libsys/_access.c b/mach/minix/libsys/_access.c
index b90aec07..5bfd12fb 100644
--- a/mach/minix/libsys/_access.c
+++ b/mach/minix/libsys/_access.c
@@ -1,7 +1,8 @@
 #include <lib.h>
 #define access	_access
+#include <unistd.h>
 
-int access(name, mode)
+PUBLIC int access(name, mode)
 char *name;
 int mode;
 {
diff --git a/mach/minix/libsys/_alarm.c b/mach/minix/libsys/_alarm.c
index 6acc6c9f..605ec130 100644
--- a/mach/minix/libsys/_alarm.c
+++ b/mach/minix/libsys/_alarm.c
@@ -1,7 +1,8 @@
 #include <lib.h>
 #define alarm	_alarm
+#include <unistd.h>
 
-unsigned int alarm(sec)
+PUBLIC unsigned int alarm(sec)
 unsigned int sec;
 {
   return(_callm1(MM, ALARM, (int) sec, 0, 0, NIL_PTR, NIL_PTR, NIL_PTR));
diff --git a/mach/minix/libsys/_brk.c b/mach/minix/libsys/_brk.c
index 1f2e565a..82bbe6a8 100644
--- a/mach/minix/libsys/_brk.c
+++ b/mach/minix/libsys/_brk.c
@@ -1,6 +1,7 @@
 #include <lib.h>
 #define brk	_brk
 #define sbrk	_sbrk
+#include <unistd.h>
 
 extern char *_brksize;
 
diff --git a/mach/minix/libsys/_chdir.c b/mach/minix/libsys/_chdir.c
index 28b6f734..0373eb37 100644
--- a/mach/minix/libsys/_chdir.c
+++ b/mach/minix/libsys/_chdir.c
@@ -1,7 +1,8 @@
 #include <lib.h>
 #define chdir	_chdir
+#include <unistd.h>
 
-int chdir(name)
+PUBLIC int chdir(name)
 char *name;
 {
   return(_callm3(FS, CHDIR, 0, name));
diff --git a/mach/minix/libsys/_chmod.c b/mach/minix/libsys/_chmod.c
index b486669a..4306d7b6 100644
--- a/mach/minix/libsys/_chmod.c
+++ b/mach/minix/libsys/_chmod.c
@@ -1,8 +1,9 @@
 #include <lib.h>
 #define chmod	_chmod
+#include <sys/stat.h>
 
 PUBLIC int chmod(name, mode)
-char *name;
+_CONST char *name;
 mode_t mode;
 {
   return(_callm3(FS, CHMOD, mode, name));
diff --git a/mach/minix/libsys/_chown.c b/mach/minix/libsys/_chown.c
index d4bf691a..53531c16 100644
--- a/mach/minix/libsys/_chown.c
+++ b/mach/minix/libsys/_chown.c
@@ -1,5 +1,6 @@
 #include <lib.h>
 #define chown	_chown
+#include <unistd.h>
 
 PUBLIC int chown(name, owner, grp)
 char *name;
diff --git a/mach/minix/libsys/_chroot.c b/mach/minix/libsys/_chroot.c
index 50d1ef9e..b5b3ee58 100644
--- a/mach/minix/libsys/_chroot.c
+++ b/mach/minix/libsys/_chroot.c
@@ -1,8 +1,9 @@
 #include <lib.h>
 #define chroot	_chroot
+#include <unistd.h>
 
 PUBLIC int chroot(name)
-char *name;
+_CONST char *name;
 {
   return(_callm3(FS, CHROOT, 0, name));
 }
diff --git a/mach/minix/libsys/_close.c b/mach/minix/libsys/_close.c
index cedb28e1..9da9c152 100644
--- a/mach/minix/libsys/_close.c
+++ b/mach/minix/libsys/_close.c
@@ -1,5 +1,6 @@
 #include <lib.h>
 #define close	_close
+#include <unistd.h>
 
 PUBLIC int close(fd)
 int fd;
diff --git a/mach/minix/libsys/_creat.c b/mach/minix/libsys/_creat.c
index 671c8770..b8ce7dea 100644
--- a/mach/minix/libsys/_creat.c
+++ b/mach/minix/libsys/_creat.c
@@ -1,8 +1,9 @@
 #include <lib.h>
 #define creat	_creat
+#include <fcntl.h>
 
 PUBLIC int creat(name, mode)
-char *name;
+_CONST char *name;
 mode_t mode;
 {
   return(_callm3(FS, CREAT, mode, name));
diff --git a/mach/minix/libsys/_dup.c b/mach/minix/libsys/_dup.c
index c7013468..1a120634 100644
--- a/mach/minix/libsys/_dup.c
+++ b/mach/minix/libsys/_dup.c
@@ -1,5 +1,6 @@
 #include <lib.h>
 #define dup	_dup
+#include <unistd.h>
 #include <fcntl.h>
 
 PUBLIC int dup(fd)
diff --git a/mach/minix/libsys/_dup2.c b/mach/minix/libsys/_dup2.c
index 6b7046fa..4a8e8e19 100644
--- a/mach/minix/libsys/_dup2.c
+++ b/mach/minix/libsys/_dup2.c
@@ -1,5 +1,6 @@
 #include <lib.h>
 #define dup2     _dup2
+#include <unistd.h>
 #include <fcntl.h>
 #include <limits.h>
 #include <errno.h>
diff --git a/mach/minix/libsys/_execnl.c b/mach/minix/libsys/_execnl.c
index 759cf005..97a9e754 100644
--- a/mach/minix/libsys/_execnl.c
+++ b/mach/minix/libsys/_execnl.c
@@ -5,6 +5,7 @@
  */
 #include <lib.h>
 #include <sys/types.h>
+#include <unistd.h>
 
 #define MAXSTK	256		/* maximum EXEC stack size */
 #define	PTRSIZE	sizeof(char *)
diff --git a/mach/minix/libsys/_fork.c b/mach/minix/libsys/_fork.c
index 3f0c70ac..0cf123b1 100644
--- a/mach/minix/libsys/_fork.c
+++ b/mach/minix/libsys/_fork.c
@@ -1,5 +1,6 @@
 #include <lib.h>
 #define fork	_fork
+#include <unistd.h>
 
 PUBLIC int fork()
 {
diff --git a/mach/minix/libsys/_getegid.c b/mach/minix/libsys/_getegid.c
index 7cf60645..1508cc47 100644
--- a/mach/minix/libsys/_getegid.c
+++ b/mach/minix/libsys/_getegid.c
@@ -1,6 +1,7 @@
 #include <lib.h>
 #include <sys/types.h>
 #define getegid	_getegid
+#include <unistd.h>
 
 PUBLIC gid_t getegid()
 {
diff --git a/mach/minix/libsys/_geteuid.c b/mach/minix/libsys/_geteuid.c
index da174682..230b3e56 100644
--- a/mach/minix/libsys/_geteuid.c
+++ b/mach/minix/libsys/_geteuid.c
@@ -1,6 +1,7 @@
 #include <lib.h>
 #include <sys/types.h>
 #define geteuid	_geteuid
+#include <unistd.h>
 
 PUBLIC uid_t geteuid()
 {
diff --git a/mach/minix/libsys/_getgid.c b/mach/minix/libsys/_getgid.c
index ea29a328..38b71233 100644
--- a/mach/minix/libsys/_getgid.c
+++ b/mach/minix/libsys/_getgid.c
@@ -1,6 +1,7 @@
 #include <lib.h>
 #include <sys/types.h>
 #define getgid	_getgid
+#include <unistd.h>
 
 PUBLIC gid_t getgid()
 {
diff --git a/mach/minix/libsys/_getpid.c b/mach/minix/libsys/_getpid.c
index 3ba2f5c3..6847d3ca 100644
--- a/mach/minix/libsys/_getpid.c
+++ b/mach/minix/libsys/_getpid.c
@@ -1,5 +1,6 @@
 #include <lib.h>
 #define getpid	_getpid
+#include <unistd.h>
 
 PUBLIC int getpid()
 {
diff --git a/mach/minix/libsys/_getppid.c b/mach/minix/libsys/_getppid.c
index ba128c29..b54666ac 100644
--- a/mach/minix/libsys/_getppid.c
+++ b/mach/minix/libsys/_getppid.c
@@ -1,5 +1,6 @@
 #include <lib.h>
 #define getppid	_getppid
+#include <unistd.h>
 
 PUBLIC int getppid()
 {
diff --git a/mach/minix/libsys/_getuid.c b/mach/minix/libsys/_getuid.c
index 691863ce..ab2b4678 100644
--- a/mach/minix/libsys/_getuid.c
+++ b/mach/minix/libsys/_getuid.c
@@ -1,6 +1,7 @@
 #include <lib.h>
 #include <sys/types.h>
 #define getuid	_getuid
+#include <unistd.h>
 
 PUBLIC uid_t getuid()
 {
diff --git a/mach/minix/libsys/_link.c b/mach/minix/libsys/_link.c
index 81b1f61a..d2164284 100644
--- a/mach/minix/libsys/_link.c
+++ b/mach/minix/libsys/_link.c
@@ -1,8 +1,9 @@
 #include <lib.h>
 #define link	_link
+#include <unistd.h>
 
 PUBLIC int link(name, name2)
-char *name, *name2;
+_CONST char *name, *name2;
 {
   return(_callm1(FS, LINK, _len(name), _len(name2), 0,
 	 (char *) name, (char *) name2,	/* perhaps callm1 preserves these */
diff --git a/mach/minix/libsys/_lseek.c b/mach/minix/libsys/_lseek.c
index 5cc9640e..d2f3993c 100644
--- a/mach/minix/libsys/_lseek.c
+++ b/mach/minix/libsys/_lseek.c
@@ -1,6 +1,7 @@
 #include <lib.h>
 #include <sys/types.h>
 #define lseek	_lseek
+#include <unistd.h>
 
 PUBLIC off_t lseek(fd, offset, whence)
 int fd;
diff --git a/mach/minix/libsys/_mkdir.c b/mach/minix/libsys/_mkdir.c
index 1e0bb7d8..7fc46fcb 100644
--- a/mach/minix/libsys/_mkdir.c
+++ b/mach/minix/libsys/_mkdir.c
@@ -3,7 +3,7 @@
 #include <sys/stat.h>
 
 PUBLIC int mkdir(name, mode)
-char *name;
+_CONST char *name;
 int mode;
 {
   return(_callm1(FS, MKDIR, _len(name), mode, 0, (char *)name, NIL_PTR, NIL_PTR));
diff --git a/mach/minix/libsys/_mkfifo.c b/mach/minix/libsys/_mkfifo.c
index 0cef8a7c..4d41f929 100644
--- a/mach/minix/libsys/_mkfifo.c
+++ b/mach/minix/libsys/_mkfifo.c
@@ -4,7 +4,7 @@
 #include <sys/stat.h>
 
 PUBLIC int mkfifo(name, mode)
-char *name;
+_CONST char *name;
 int mode;
 {
   mode = (mode & 0777) | S_IFIFO;
diff --git a/mach/minix/libsys/_mknod.c b/mach/minix/libsys/_mknod.c
index 32e6c828..ca83f62b 100644
--- a/mach/minix/libsys/_mknod.c
+++ b/mach/minix/libsys/_mknod.c
@@ -1,8 +1,9 @@
 #include <lib.h>
 #define mknod	_mknod
+#include <unistd.h>
 
 PUBLIC int mknod(name, mode, addr)
-char *name;
+_CONST char *name;
 int mode, addr;
 {
   return(_callm1(FS, MKNOD, _len(name), mode, addr,
diff --git a/mach/minix/libsys/_mknod4.c b/mach/minix/libsys/_mknod4.c
index b254e37b..de7682b5 100644
--- a/mach/minix/libsys/_mknod4.c
+++ b/mach/minix/libsys/_mknod4.c
@@ -1,8 +1,9 @@
 #include <lib.h>
 #define mknod4	_mknod4
+#include <unistd.h>
 
 PUBLIC int mknod4(name, mode, addr, size)
-char *name;
+_CONST char *name;
 int mode, addr;
 unsigned int size;
 {
diff --git a/mach/minix/libsys/_mount.c b/mach/minix/libsys/_mount.c
index 6eb3e748..52ba1d9e 100644
--- a/mach/minix/libsys/_mount.c
+++ b/mach/minix/libsys/_mount.c
@@ -1,5 +1,6 @@
 #include <lib.h>
 #define mount	_mount
+#include <unistd.h>
 
 PUBLIC int mount(special, name, rwflag)
 char *name, *special;
diff --git a/mach/minix/libsys/_open.c b/mach/minix/libsys/_open.c
index cbbaaadd..5f0f94ae 100644
--- a/mach/minix/libsys/_open.c
+++ b/mach/minix/libsys/_open.c
@@ -23,7 +23,7 @@ PUBLIC int open(const char *name, int flags, ...)
 }
 #else
 PUBLIC int open(name, flags, mode)
-char *name;
+_CONST char *name;
 int flags, mode;
 {
   if (flags & O_CREAT)
diff --git a/mach/minix/libsys/_pause.c b/mach/minix/libsys/_pause.c
index c1cc651b..2a92a9a3 100644
--- a/mach/minix/libsys/_pause.c
+++ b/mach/minix/libsys/_pause.c
@@ -1,5 +1,6 @@
 #include <lib.h>
 #define pause	_pause
+#include <unistd.h>
 
 PUBLIC int pause()
 {
diff --git a/mach/minix/libsys/_pipe.c b/mach/minix/libsys/_pipe.c
index c85f3d9d..4cfce755 100644
--- a/mach/minix/libsys/_pipe.c
+++ b/mach/minix/libsys/_pipe.c
@@ -1,5 +1,6 @@
 #include <lib.h>
 #define pipe	_pipe
+#include <unistd.h>
 
 PUBLIC int pipe(fild)
 int fild[2];
diff --git a/mach/minix/libsys/_ptrace.c b/mach/minix/libsys/_ptrace.c
index 89017518..b74dfa2a 100644
--- a/mach/minix/libsys/_ptrace.c
+++ b/mach/minix/libsys/_ptrace.c
@@ -1,5 +1,6 @@
 #include <lib.h>
 #define ptrace _ptrace
+#include <unistd.h>
 
 PUBLIC long ptrace(req, pid, addr, data)
 int req, pid;
diff --git a/mach/minix/libsys/_read.c b/mach/minix/libsys/_read.c
index 5e20391e..ac4e90ee 100644
--- a/mach/minix/libsys/_read.c
+++ b/mach/minix/libsys/_read.c
@@ -1,5 +1,6 @@
 #include <lib.h>
 #define read	_read
+#include <unistd.h>
 
 PUBLIC int read(fd, buffer, nbytes)
 int fd;
diff --git a/mach/minix/libsys/_rename.c b/mach/minix/libsys/_rename.c
index c1c2906d..80495e5e 100644
--- a/mach/minix/libsys/_rename.c
+++ b/mach/minix/libsys/_rename.c
@@ -1,8 +1,9 @@
 #include <lib.h>
 #define rename	_rename
+#include <stdio.h>
 
 PUBLIC int rename(name, name2)
-char *name, *name2;
+_CONST char *name, *name2;
 {
   return(_callm1(FS, RENAME, _len(name), _len(name2), 0,
 	 (char *) name, (char *) name2,	/* perhaps callm1 preserves these */
diff --git a/mach/minix/libsys/_rmdir.c b/mach/minix/libsys/_rmdir.c
index 273ebbe0..dedcdb24 100644
--- a/mach/minix/libsys/_rmdir.c
+++ b/mach/minix/libsys/_rmdir.c
@@ -1,8 +1,9 @@
 #include <lib.h>
 #define rmdir	_rmdir
+#include <unistd.h>
 
 PUBLIC int rmdir(name)
-char *name;
+_CONST char *name;
 {
   return(_callm3(FS, RMDIR, 0, name));
 }
diff --git a/mach/minix/libsys/_setgid.c b/mach/minix/libsys/_setgid.c
index 2f597166..9972bec4 100644
--- a/mach/minix/libsys/_setgid.c
+++ b/mach/minix/libsys/_setgid.c
@@ -1,6 +1,7 @@
 #include <lib.h>
 #include <sys/types.h>
 #define setgid	_setgid
+#include <unistd.h>
 
 PUBLIC int setgid(grp)
 gid_t grp;
diff --git a/mach/minix/libsys/_setuid.c b/mach/minix/libsys/_setuid.c
index c5f41201..921635d2 100644
--- a/mach/minix/libsys/_setuid.c
+++ b/mach/minix/libsys/_setuid.c
@@ -1,6 +1,7 @@
 #include <lib.h>
 #include <sys/types.h>
 #define setuid	_setuid
+#include <unistd.h>
 
 PUBLIC int setuid(usr)
 int usr;
diff --git a/mach/minix/libsys/_stat.c b/mach/minix/libsys/_stat.c
index 1fcd7dd5..329b0141 100644
--- a/mach/minix/libsys/_stat.c
+++ b/mach/minix/libsys/_stat.c
@@ -3,7 +3,7 @@
 #include <sys/stat.h>
 
 PUBLIC int stat(name, buffer)
-char *name;
+_CONST char *name;
 struct stat *buffer;
 {
   return(_callm1(FS, STAT, _len(name), 0, 0,
diff --git a/mach/minix/libsys/_stime.c b/mach/minix/libsys/_stime.c
index 8399cd2c..9fa8e16a 100644
--- a/mach/minix/libsys/_stime.c
+++ b/mach/minix/libsys/_stime.c
@@ -1,5 +1,6 @@
 #include <lib.h>
 #define stime _stime
+#include <unistd.h>
 
 PUBLIC int stime(top)
 long *top;
diff --git a/mach/minix/libsys/_sync.c b/mach/minix/libsys/_sync.c
index 36186692..c72e8620 100644
--- a/mach/minix/libsys/_sync.c
+++ b/mach/minix/libsys/_sync.c
@@ -1,5 +1,6 @@
 #include <lib.h>
 #define sync	_sync
+#include <unistd.h>
 
 PUBLIC int sync()
 {
diff --git a/mach/minix/libsys/_umount.c b/mach/minix/libsys/_umount.c
index e4132bbc..103538c6 100644
--- a/mach/minix/libsys/_umount.c
+++ b/mach/minix/libsys/_umount.c
@@ -1,8 +1,9 @@
 #include <lib.h>
 #define umount	_umount
+#include <unistd.h>
 
 PUBLIC int umount(name)
-char *name;
+_CONST char *name;
 {
   return(_callm3(FS, UMOUNT, 0, name));
 }
diff --git a/mach/minix/libsys/_unlink.c b/mach/minix/libsys/_unlink.c
index ebaea4ea..3d225a76 100644
--- a/mach/minix/libsys/_unlink.c
+++ b/mach/minix/libsys/_unlink.c
@@ -1,8 +1,9 @@
 #include <lib.h>
 #define unlink	_unlink
+#include <unistd.h>
 
 PUBLIC int unlink(name)
-char *name;
+_CONST char *name;
 {
   return(_callm3(FS, UNLINK, 0, name));
 }
diff --git a/mach/minix/libsys/_write.c b/mach/minix/libsys/_write.c
index 9dd96af8..a64da03a 100644
--- a/mach/minix/libsys/_write.c
+++ b/mach/minix/libsys/_write.c
@@ -1,5 +1,6 @@
 #include <lib.h>
 #define write	_write
+#include <unistd.h>
 
 PUBLIC int write(fd, buffer, nbytes)
 int fd;