[wmii] clock-skew while installing wmii

i have installed the lastest snap from
http://www.suckless.org/snaps/wmii+ixp-20070516.tgz

it runs fine, no problem yet. i got a warning-message something like
this while doing "make clean install":

make[1]: File /dev/null has modification time 5.2e+d31 in future
make[1]: clock skew detected. your build may be incomplete

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http://arnuld.blogspot.com/