diff --git a/include/minix/callnr.h b/include/minix/callnr.h
index 29dbff2d2..b4a81effc 100755
--- a/include/minix/callnr.h
+++ b/include/minix/callnr.h
@@ -82,5 +82,7 @@
 #define GETPRIORITY       88	/* to PM */
 #define SETPRIORITY       89	/* to PM */
 #define GETTIMEOFDAY      90	/* to PM */
-#define SETEUID		  91	/* to PM (and PM -> FS) */
-#define SETEGID		  92	/* to PM (and PM -> FS) */
+#define SETEUID		  91	/* to PM */
+#define SETEGID		  92	/* to PM */
+#define TRUNCATE	  93	/* to FS */
+#define FTRUNCATE	  94	/* to FS */
diff --git a/include/sys/stat.h b/include/sys/stat.h
index e792f6c5b..45debc803 100755
--- a/include/sys/stat.h
+++ b/include/sys/stat.h
@@ -65,7 +65,6 @@ struct stat {
 #define S_ISBLK(m)	(((m) & S_IFMT) == S_IFBLK)	/* is a block spec */
 #define S_ISLNK(m)	(((m) & S_IFMT) == S_IFLNK)	/* is a symlink */
 #define S_ISFIFO(m)	(((m) & S_IFMT) == S_IFIFO)	/* is a pipe/FIFO */
-#define S_ISLNK(m)      (((m) & S_IFMT) == S_IFLNK)     /* is a sym link */
 
 /* Function Prototypes. */
 _PROTOTYPE( int chmod, (const char *_path, _mnx_Mode_t _mode)		);
diff --git a/include/unistd.h b/include/unistd.h
index 2b8d45150..7940789a1 100755
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -139,6 +139,7 @@ _PROTOTYPE( ssize_t write, (int _fd, const void *_buf, size_t _n)	);
 
 /* Open Group Base Specifications Issue 6 (not complete) */
 _PROTOTYPE( int symlink, (const char *path1, const char *path2)		);
+_PROTOTYPE( int readlink, (const char *, char *, int)			);
 _PROTOTYPE( int getopt, (int _argc, char **_argv, char *_opts)		);
 extern char *optarg;
 extern int optind, opterr, optopt;
@@ -173,6 +174,8 @@ _PROTOTYPE( int getpprocnr, (void)					);
 _PROTOTYPE( int findproc, (char *proc_name, int *proc_nr)		);
 _PROTOTYPE( int allocmem, (phys_bytes size, phys_bytes *base)		);
 _PROTOTYPE( int freemem, (phys_bytes size, phys_bytes base)		);
+_PROTOTYPE( int truncate, (const char *_path, off_t _length)		);
+_PROTOTYPE( int ftruncate, (int _fd, off_t _length)			);
 #define DEV_MAP 1
 #define DEV_UNMAP 2
 #define mapdriver(driver, device, style) devctl(DEV_MAP, driver, device, style)