Thanks,

this was due to the fact that buildPythonPackage function was changed to
disable evaluation for unsupported interpreter inside the generic builder
instead of
the previous behavior which disabled evaluating buildPythonPackage itself.

See
https://github.com/NixOS/nixpkgs/commit/b653e3f6614fbe2664b1fd09d3baf5222b4de7f2

I'm going to revert your commit also, as it's not needed anymore.

On Mon, Feb 23, 2015 at 7:51 PM, Bjørn Forsman <[email protected]>
wrote:

> On 23 February 2015 at 19:23, Bjørn Forsman <[email protected]>
> wrote:
> > I'm a bit confused, this fails on master branch:
> >
> > $ nix-env -f . -qa \* --meta --xml --drv-path --show-trace >/dev/null
> > ...
> > error: while querying the derivation named ‘pypy2.5-graph-tool-2.2.36’:
> > while evaluating the attribute ‘preConfigure’ of the derivation
> > ‘pypy2.5-graph-tool-2.2.36’ at
> >
> "/home/bfo/nixpkgs/pkgs/development/python-modules/graph-tool/2.x.x.nix":5:3:
> > attribute ‘sitePackages’ missing, at
> >
> "/home/bfo/nixpkgs/pkgs/development/python-modules/graph-tool/2.x.x.nix":22:54
>
> I disabled that package for pypy:
>
>
> https://github.com/NixOS/nixpkgs/commit/6afc1907c85fe3a244bd8a52d76f45297f06419e
>
> - Bjørn
>
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