An Issue with TeXLive 2013 / 2014

I recently updated a TeXLive 2013 installation to 2014 on a server, and XeLaTeX stoped working. First it kept running that

kpathsea: Running mktexfmt xelatex.fmt
I can't find the format file `xelatex.fmt'! 

So I googled and stackoverflowed and saw that I can rebuild this fmt file with

fmtutil --byfmt=xetex

But it told me that it was trying to get some file:

! I can't find file `dehypht-x-2013-05-26.tex'.

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