{eunit_opts, [verbose]}.

{pre_hooks, [{"(linux|darwin|solaris)", compile, "make -C c_src"},
             {"(freebsd|openbsd)", compile, "gmake -C c_src"}
            ]}.
{post_hooks, [{"(linux|darwin|solaris)", clean, "make -C c_src clean"},
              {"(freebsd|openbsd)", clean, "gmake -C c_src clean"}
             ]}.