Biopython allows users to call external cli tools via python bindings. One example of such a tool is from Bio.Emboss.Applications import Primer3Commandline This tool uses the eprimer3 emboss command which in turn uses the primer3_core program from primer3. This should be taken into account in the dependencies of biopython and eboss.
This bug actually contains two related requests, so I filed a separate report.
+ 26 Mar 2015; Justin Lecher <jlec@gentoo.org> biopython-1.65.ebuild: + Add note for embos support, bug #543510 +