Gentoo's Bugzilla –
Attachment 374226 Details for
Bug 506652app-misc/sphinx-0.9.9 - automake-1.13: warnings are treated as errors -//- /usr/share/automake-1.13/am/library.am: warning: 'libstemmer.a': linking libraries using a non-POSIX archiver requires 'AM_PROG_AR' in 'configure.ac'