The attached recipe fails with the following output:

...
starting phase `build'
running "python setup.py" with command "build" and parameters ()
running build
...
phase `build' succeeded after 0 seconds
starting phase `check'
running "python setup.py" with command "test" and parameters ()
running test
phase `check' succeeded after 1 seconds
starting phase `install'
running "python setup.py" with command "install" and parameters ("--prefix=/nix/store/5412ag0jg15k7gnd2z4ardg735iawr8l-aarddict-0.9.3" "--install-data=/nix/store/5412ag0jg15k7gnd2z4ardg735iawr8l-aarddict-0.9.3")
running install
...
byte-compiling build/bdist.linux-x86_64/egg/tests/test_config.py to test_config.pyc
byte-compiling build/bdist.linux-x86_64/egg/tests/test_checksum.py to test_checksum.pyc
byte-compiling build/bdist.linux-x86_64/egg/tests/__init__.py to __init__.pyc
installing package data to build/bdist.linux-x86_64/egg
running install_data
creating /nix/store/a1x98y7y83j4x4d4pk21w9m4f60dgs9r-python-2.7.5/share/icons
error: could not create '/nix/store/a1x98y7y83j4x4d4pk21w9m4f60dgs9r-python-2.7.5/share/icons': Permission denied
phase `install' failed after 2 seconds

Apparently, install_data tries to write into the python directory, although
a different prefix is given; later, I also added the "--install-data"
configure flag, the behaviour is the same in both cases.

Does any of the python gurus understand the problem?

Andreas