app-text/hunspell-1.1.5 and newer lost USE=nls for some reason. Please reintroduce it to be able to have a chance of using hunspell with uclibc embedded profile and therefore xulrunner-1.9/firefox3 with uclibc. 1.1.4-r2 has it, and it should still work, as --disable-nls is there (will test soon, first I need to add c++ support to my toolchain..).
Thank you for report! Fixed in hunspell-1.2.3.