[Nix-dev] setting environment values.

[Tim Sears]

I am writing a nix expression to port some libraries from another distro.

The libraries have slightly non-standard locations so I would typically add
some line to my .bashrc file like

export SOMEVAR="somestring"
export SOMEPATH=/opt/path/to/libs
export LD_LIBRARY_PATH=$SOMEPATH:$LD_LIBRARY_PATH.

What is the nix way of doing this? I can set SOMEVAR="somestring" in the
derivation expression, and it appears in my environment after executing
nix-shell, but SOMEPATH should look like $out/path/to/libs and I am not
sure how/where to set that.

Suggestions appreciated.
-Tim
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