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# X.org {#sec-xorg}
The Nix expressions for the X.org packages reside in
`pkgs/servers/x11/xorg/default.nix`. This file is automatically generated from
lists of tarballs in an X.org release. As such it should not be modified
directly; rather, you should modify the lists, the generator script or the
file `pkgs/servers/x11/xorg/overrides.nix`, in which you can override or add
to the derivations produced by the generator.
The generator is invoked as follows:
```sh
cd pkgs/servers/x11/xorg
cat tarballs-7.4.list extra.list old.list | perl ./generate-expr-from-tarballs.pl
```
For each of the tarballs in the `.list` files, the script downloads it,
unpacks it, and searches its `configure.ac` and `*.pc.in` files for
dependencies. This information is used to generate `default.nix`. The
generator caches downloaded tarballs between runs. Pay close attention to the
`NOT FOUND: $NAME` messages at the end of the run, since they may indicate
missing dependencies. (Some might be optional dependencies, however.)
A file like `tarballs-7.4.list` contains all tarballs in a X.org release. It
can be generated like this:
```sh
export i="mirror://xorg/X11R7.4/src/everything/"
cat $(PRINT_PATH=1 nix-prefetch-url $i | tail -n 1) \
| perl -e 'while (<>) { if (/(href|HREF)="([^"]*.bz2)"/) { print "$ENV{'i'}$2\n"; }; }' \
| sort > tarballs-7.4.list
```
`extra.list` contains libraries that aren’t part of X.org proper, but are
closely related to it, such as `libxcb`. `old.list` contains some packages
that were removed from X.org, but are still needed by some people or by other
packages (such as `imake`).
If the expression for a package requires derivation attributes that the
generator cannot figure out automatically (say, `patches` or a `postInstall`
hook), you should modify `pkgs/servers/x11/xorg/overrides.nix`.
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