You deleted stuff that must be there for it to work.
Read buildit.s, inittab, rc.S, and rc.M, you need various things at build
time and boot time. In init, rc.M and rc.S, at boot time, you MUST have:
agetty ash mount mkfs.minix dd init
bzip2 cpio update cp gzip umount shutdown
In buildit.s, moreover, you must have:
du mkdir hostname awk cd ls find cut sort
wc sed fdformat fdflush lilo tar rm
So, if you delete ANYTHING from the first list, you will have to fix the
rc.S and rc.M and inittab, if you delete ANYTHING from the second list you
may have to fix buildit.s to use and/or work correctly with your local
versions of those programs at build time.
There may also be more things that are required, but, those 2 lists of
stuff can be considered the minimal list of stuff not to tamper with if
you don't want to break the basic structure...
-Tom