diff --git a/release/picobsd/build/write_mfs_in_kernel.c b/release/picobsd/build/write_mfs_in_kernel.c
deleted file mode 100644
index 06403c8573c9..000000000000
--- a/release/picobsd/build/write_mfs_in_kernel.c
+++ /dev/null
@@ -1,114 +0,0 @@
-/*
- * ----------------------------------------------------------------------------
- * "THE BEER-WARE LICENSE" (Revision 42):
- * <phk@FreeBSD.org> wrote this file.  As long as you retain this notice you
- * can do whatever you want with this stuff. If we meet some day, and you think
- * this stuff is worth it, you can buy me a beer in return.   Poul-Henning Kamp
- * ----------------------------------------------------------------------------
- *
- * $FreeBSD$
- *
- * This program patches a filesystem into a kernel made with MD_ROOT
- * option.
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <sys/types.h>
-#include <sys/param.h>
-#include <sys/stat.h>
-#include <sys/disklabel.h>
-#include <ufs/ufs/dinode.h>
-#include <ufs/ffs/fs.h>
-
-static int sblock_try[] = SBLOCKSEARCH;
-static int force = 0;	/* don't check for zeros, may corrupt kernel */
-
-int
-main(int argc, char **argv)
-{
-	unsigned char *buf_kernel, *buf_fs, *p,*q, *prog;
-	int fd_kernel, fd_fs, ch, errs=0;
-	struct stat st_kernel, st_fs;
-	struct fs *fs;
-	u_long l, sboff;
-
-	prog= *argv;
-	while ((ch = getopt(argc, argv, "f")) != EOF)
-		switch(ch) {                                                       
-		case 'f':                                                          
-			force = 1 - force;
-			break;   
-		default:
-			errs++;
-		}
-	argc -= optind;
-	argv += optind;
-
-	if (errs || argc != 2) {
-		fprintf(stderr,"Usage:\n\t%s [-f] kernel fs\n", prog);
-		exit(2);
-	}
-	--argv;	/* original prog did not use getopt(3) */
-	fd_kernel = open(argv[1],O_RDWR);
-	if (fd_kernel < 0) { perror(argv[1]); exit(2); }
-	fstat(fd_kernel,&st_kernel);
-	fd_fs = open(argv[2],O_RDONLY);
-	if (fd_fs < 0) { perror(argv[2]); exit(2); }
-	fstat(fd_fs,&st_fs);
-	buf_kernel = malloc(st_kernel.st_size);
-	if (!buf_kernel) { perror("malloc"); exit(2); }
-	buf_fs = malloc(st_fs.st_size);
-	if (!buf_fs) { perror("malloc"); exit(2); }
-	if (st_kernel.st_size != read(fd_kernel,buf_kernel,st_kernel.st_size))
-		{ perror(argv[1]); exit(2); }
-	if (st_fs.st_size != read(fd_fs,buf_fs,st_fs.st_size))
-		{ perror(argv[2]); exit(2); }
-	for(l=0,p=buf_kernel; l < st_kernel.st_size - st_fs.st_size ; l++,p++ )
-		if(*p == 'M' && !strcmp(p,"MFS Filesystem goes here"))
-			goto found;
-	fprintf(stderr,"MFS filesystem signature not found in %s\n",argv[1]);
-	exit(1);
-found:
-	for (l = 0; sblock_try[l] != -1; l++) {
-		sboff = sblock_try[l];
-		fs = (struct fs *)(buf_fs + sboff);
-		if ((fs->fs_magic == FS_UFS1_MAGIC ||
-		     (fs->fs_magic == FS_UFS2_MAGIC &&
-		      fs->fs_sblockloc == numfrags(fs, sblock_try[l]))) &&
-		    fs->fs_bsize <= MAXBSIZE &&
-		    fs->fs_bsize >= sizeof(struct fs))
-			break;
-	}
-	if (sblock_try[l] == -1) {
-		fprintf(stderr, "Cannot find filesystem\n");
-		exit(2);
-	}
-	if (!force)
-		for(l=0,q= p + sboff; l < st_fs.st_size - sboff ; l++,q++ )
-			if (*q)
-				goto fail;
-	memcpy(p+sboff,buf_fs+sboff,st_fs.st_size-sboff);
-	lseek(fd_kernel,0L,SEEK_SET);
-	if (st_kernel.st_size != write(fd_kernel,buf_kernel,st_kernel.st_size))
-		{ perror(argv[1]); exit(2); }
-	exit(0);
-fail:
-	l += sboff;
-	fprintf(stderr,"Obstruction in kernel after %ld bytes (%ld Kbyte)\n",
-		l, l/1024);
-	fprintf(stderr,"Filesystem is %ld bytes (%ld Kbyte)\n",
-		(u_long)st_fs.st_size, (u_long)st_fs.st_size/1024);
-	exit(1);
-}
-
-/*
- * I added a '-f' option to force writing the image into the kernel, even when
- * there is already data (i.e. not zero) in the written area. This is useful
- * to rewrite a changed MD-image. Beware: If the written image is larger than
- * the space reserved in the kernel (with option MD_ROOT) then
- * THIS WILL CORRUPT THE KERNEL!
- *
- */