[tz] tzdb-2018b does not work after make clean

[大山俊成]

Hello, I'm Ohyama.

I downloaded tzdb-2018b.tar.lz  and  did as followings
    make TOPDIR=$HOME/tzdir install
    $HOME/tzdir/usr/bin/zdump -v America/Los_Angeles
it works good !

But once I do clean by
    make clean
And again
    make TOPDIR=$HOME/tzdir install
    $HOME/tzdir/usr/bin/zdump -v America/Los_Angeles
it does not works.(error message "America/Los_Angeles: No such file or directory")

Something wrong with me?