For biopython stuff I need an upcoming GenomeDiagram package, which will hopefully be soon incorporated into biopython. The package uses reportlab with one of its addons, not installed by default on Gentoo (bug #180951). http://bioinf.scri.ac.uk/lp/programs.php just unpack the archive and run python setup.py install
Current version is 0.21 (2006)
GenomeDiagram is already incorporated into biopython: http://www.biopython.org/DIST/docs/api/Bio.Graphics.GenomeDiagram-module.html No need for a special ebuild anymore.