# make installworld DESTDIR=/jail/mail
mkdir -p /tmp/install.LALQgxPz
for prog in [ awk cap_mkdb cat chflags chmod chown  date echo egrep find grep install-info  ln lockf make mkdir mtree mv pwd_mkdb rm sed sh sysctl  test true uname wc zic; do  cp `which $prog` /tmp/install.LALQgxPz;  done
cd /usr/src; MAKEOBJDIRPREFIX=/usr/obj  MACHINE_ARCH=i386  MACHINE=i386  CPUTYPE=  GROFF_BIN_PATH=/usr/obj/usr/src/tmp/legacy/usr/bin  GROFF_FONT_PATH=/usr/obj/usr/src/tmp/legacy/usr/share/groff_font  GROFF_TMAC_PATH=/usr/obj/usr/src/tmp/legacy/usr/share/tmac  PATH=/usr/obj/usr/src/tmp/legacy/usr/sbin:/usr/obj/usr/src/tmp/legacy/usr/bin:/usr/obj/usr/src/tmp/legacy/usr/games:/usr/obj/usr/src/tmp/usr/sbin:/usr/obj/usr/src/tmp/usr/bin:/usr/obj/usr/src/tmp/usr/games:/tmp/install.LALQgxPz make -f Makefile.inc1 reinstall
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>>> Making hierarchy
--------------------------------------------------------------
cd /usr/src; make -f Makefile.inc1 hierarchy
cd /usr/src/etc;                make distrib-dirs
mtree -eU  -f /usr/src/etc/mtree/BSD.root.dist -p /jail/mail/
mtree -eU  -f /usr/src/etc/mtree/BSD.var.dist -p /jail/mail/var
mtree -eU  -f /usr/src/etc/mtree/BSD.usr.dist -p /jail/mail/usr
mtree -eU  -f /usr/src/etc/mtree/BSD.include.dist  -p /jail/mail/usr/include
cd /jail/mail/; rm -f /jail/mail/sys; ln -s usr/src/sys sys
rm: /jail/mail/sys: is a directory
*** Error code 1

Stop in /usr/src/etc.
*** Error code 1

Stop in /usr/src.
*** Error code 1

Stop in /usr/src.
*** Error code 1

Stop in /usr/src.
*** Error code 1

Stop in /usr/src.