[leo@colnixos:/tmp/n]$ result/bin/manage.py runserver
  File "/nix/store/dgcsv3bcw4v39r79hik6ws80qh1pakag-python3.6-mydjangowebsite-1.0/bin/manage.py", line 2
    export PATH='/nix/store/y2jqsq63bhf3rz51hrg8pb78fjgwzwvv-python3-3.6.8/bin:/nix/store/dgcsv3bcw4v39r79hik6ws80qh1pakag-python3.6-mydjangowebsite-1.0/bin:/nix/store/345p44wgp556fygvyxmay65jygbmh2nk-python3.6-Django-1.11.18/bin:/nix/store/158j5bzslaxhgq4s93ljslgd4b3y6kjb-python3.6-setuptools-40.6.3/bin'${PATH:+':'}$PATH
              ^
SyntaxError: invalid syntax

[leo@colnixos:/tmp/n]$ cat result/bin/manage.py
#! /nix/store/53wi068kjrqfr2j0hzcxhbw2xaa990jr-bash-4.4-p23/bin/bash -e
export PATH='/nix/store/y2jqsq63bhf3rz51hrg8pb78fjgwzwvv-python3-3.6.8/bin:/nix/store/dgcsv3bcw4v39r79hik6ws80qh1pakag-python3.6-mydjangowebsite-1.0/bin:/nix/store/345p44wgp556fygvyxmay65jygbmh2nk-python3.6-Django-1.11.18/bin:/nix/store/158j5bzslaxhgq4s93ljslgd4b3y6kjb-python3.6-setuptools-40.6.3/bin'${PATH:+':'}$PATH
export PYTHONNOUSERSITE='true'
exec -a "$0" "/nix/store/dgcsv3bcw4v39r79hik6ws80qh1pakag-python3.6-mydjangowebsite-1.0/bin/.manage.py-wrapped"  "${extraFlagsArray[@]}" "$@"