Change:
<del> { lib, stdenv, fetchurl, makeWrapper, dbus, libxml2, pam, pkg-config, pmount, python2Packages, writeScript, runtimeShell }: let # Search in the environment if the same program exists with a set uid or # set gid bit.  If it exists, run the first program found, otherwise run # the default binary. useSetUID = drv: path: let name = baseNameOf path; bin = "${drv}${path}"; in assert name != ""; writeScript "setUID-${name}" '' #!${runtimeShell} inode=$(stat -Lc %i ${bin}) for file in $(type -ap ${name}); do case $(stat -Lc %a $file) in ([2-7][0-7][0-7][0-7]) if test -r "$file".real; then orig=$(cat "$file".real) if test $inode = $(stat -Lc %i "$orig"); then exec "$file" "$@" fi fi;; esac done exec ${bin} "$@" ''; pmountBin = useSetUID pmount "/bin/pmount"; pumountBin = useSetUID pmount "/bin/pumount"; inherit (python2Packages) python dbus-python; in stdenv.mkDerivation rec { pname = "pam_usb"; version = "0.5.0"; src = fetchurl { url = "mirror://sourceforge/pamusb/pam_usb-${version}.tar.gz"; sha256 = "1g1w0s9d8mfld8abrn405ll5grv3xgs0b0hsganrz6qafdq9j7q1"; }; nativeBuildInputs = [ makeWrapper pkg-config ]; buildInputs = [ # pam_usb dependencies dbus libxml2 pam pmount # pam_usb's tools dependencies python # cElementTree is included with python 2.5 and later. ]; preBuild = '' makeFlagsArray=(DESTDIR=$out) substituteInPlace ./src/volume.c  --replace 'pmount' '${pmountBin}'  --replace 'pumount' '${pumountBin}' ''; # pmount is append to the PATH because pmounts binaries should have a set uid bit. postInstall = '' mv $out/usr/* $out/. # fix color */ rm -rf $out/usr for prog in $out/bin/pamusb-conf $out/bin/pamusb-agent; do substituteInPlace $prog --replace '/usr/bin/env python' '/bin/python' wrapProgram $prog  --prefix PYTHONPATH : "$(toPythonPath ${dbus-python})" done ''; meta = { homepage = "http://pamusb.org/"; description = "Authentication using USB Flash Drives"; license = lib.licenses.gpl2; platforms = lib.platforms.linux; }; } </del>

Discussion:
The usb pam module is broken (it requires udisks 1.0, which is not available on DBUS) Add to ; Rebuild the system; Try to run Get the following output: Add a line Rebuild the system; Try to run Get the following output: system: host os: multi-user?: sandbox: version: channels(root): channels(balsoft): nixpkgs:My config (long & dirty):
seems to be unmaintained. The GitHub and SourceForge pages seem to have no activity since 2015. It may be worth considering to deprecate and then remove the module. Cc of the NixOS security group (since this may be a security issue too)
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Coincidentally ran into this issue today. +1 for removing the package or marking it as broken.
I marked this as stale due to inactivity. &rarr;