The ebuild needs to be fixed due to python not supporting some variables.
Steps to Reproduce:
1. emerge avant-window-navigator
2. watch compilation output
3. notice warning at the end
* Deprecation Warning: python_version() is deprecated and will be banned on 2010-07-01.
* Use PYTHON() instead of python variable. Use python_get_*() instead of PYVER* variables.
* The ebuild needs to be fixed. Please report a bug, if it has not been already reported.
*** This bug has been marked as a duplicate of bug 313453 ***