rebar.config

{erl_opts, [
    {platform_define, "R1(1|2|3|4|5|6)", 'JIFFY_NO_MAPS'}
]}.

{eunit_opts, [
    verbose
]}.

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