(req'd by pascal; cc'ing ports@ in case of interest interest). Here are results from a bulk with MODGCC4_VERSION?=4.8 (this is with 4.8.0, I didn't have 4.8.1 when it started).
math/galculator: picked up libquadmath at build time, failed when dpb junked it. I didn't spot any other instances of this in the tree. www/mozilla-firefox: www/seamonkey: c++: error: unrecognized command line option '-rdynamic' mail/mimetic: ../../mimetic/tokenizer.h:150:28: error: 'setDelimList' was not declared in this scope, and no declarations were found by argument-dependent lookup at the point of instantiation [-fpermissive] editors/libreoffice: /usr/obj/libreoffice-4.0.3.3/libreoffice-4.0.3.3/desktop/source/app/app.cxx: In function 'void desktop::{anonymous}::FatalError(const rtl::OUString&)': /usr/obj/libreoffice-4.0.3.3/libreoffice-4.0.3.3/desktop/source/app/app.cxx:425:36: error: '_exit' was not declared in this scope