This is necessary for seamonkey-2 p.mask removal Reproducible: Always Steps to Reproduce:
Created attachment 215966 [details, diff] monodevelop-2.1.1.ebuild.patch possible patch
This now becomes even more urgent. Upstream officially discontinued seamonkey-1 and also wrote about known unfixed security vulnerabilities. See this news post for reference: http://www.seamonkey-project.org/news#2010-03-16
CCing QA as there's no response from dotnet herd.
Looks like INVALID. The ebuild allows such deps as www-client/firefox-bin too, so doesn't look like headers are used for building, rather to ensure www client is present.