add additional autotools instructions
add additional autotools instructions

micmro/imgmin,pornel/imgmin,rflynn/imgmin,jibsen/imgmin,micmro/imgmin,rflynn/imgmin,jibsen/imgmin,rflynn/imgmin,jibsen/imgmin,micmro/imgmin,jibsen/imgmin,rflynn/imgmin,pornel/imgmin,micmro/imgmin,pornel/imgmin,pornel/imgmin