Check attached build log. Not happy about that, not at all.
Created attachment 209530 [details] Build log
So apparently galago-sharp bindings are built from libgalago sources; so libgalago-0.5.2.tar.gz is needed in SRC_URI to be extracted into ${S}/sources/ and moved from libgalago-0.5.2 to libgalago.
For what I can see they only need the API for the generator, and then they invoke the unmanaged code, which means that 0.5.x is all good to go. I wanted to keep my revision as near as the original as possible.
+ 23 Nov 2009; Gilles Dartiguelongue <eva@gentoo.org> + -galago-sharp-0.5.0.ebuild: + Clean up old revision, bug #285760 and bug #292252. + Thanks for reporting.