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# Re: TeX now vs. Tex in legacy version

On 7/20/2012 2:25 PM, Achim Gratz wrote:
Ken Brown writes:
On 7/20/2012 2:01 AM, Fergus wrote:
```1. Currently, having recently upgraded, I can't use latex:
\$ latex a8.tex
This is pdfTeX, Version 3.1415926-2.4-1.40.13 (TeX Live 2012/Cygwin)
restricted \write18 enabled.
---! /var/lib/texmf/web2c/pdftex/latex.fmt doesn't match pdftex.pool
(Fatal format file error; I'm stymied)
```
```It looks like something went wrong with your installation of
texlive-collection-latex.  See
```
```This happened to me as well when first upgrading from teTeX to TeXlive.
The error message indicates that a different binary produced the format
file than the binary that is now trying to use it.  When this happens
after upgrading it seems to be related to a symlink not pointing to
where it should (in this case there seems to be a latex.exe file where
there should be a symlink from latex->pdftex.exe).  Since re-installing
```

There is no latex.exe in the Cygwin distribution.

```the whole of TeXlive takes so much time I just re-linked everything and
ran the script that creates the format files.  I think the fact that
some of these links are created from texconfig may be the source of the
```

The links are not created by texconfig. For example, the link latex -> pdftex.exe is in the installation tarball for texlive-collection-latex. So it should already be in place before any postinstall scripts are run.

```problem, maybe you could check if the installation really cleans all
installed) before creating the formats.  The executables generally
seem to come from the updated distribution, so I think it may just be an
interaction between some of the postinstall scripts.
```

I have no idea why some people are having this problem. No one reporting the problem has sent any information from their setup logs that might indicate what went wrong. They also haven't reported whether or not the texlive-collection-* postinstall scripts have run successfully.

Ken

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