lean</TT
>. If you are going to
    build for several platforms within the same source tree you must do
    this and re-configure for each platform.  (Alternatively, use
    a separate build tree for each platform, so that the source tree
    remains unmodified.)
   </P
></DIV
><P
>   If you perform a build and then discover that your <TT
CLASS="COMMAND"
>configure</TT
>
   options were wrong, or if you change anything that <TT
CLASS="COMMAND"
>configure</TT
>
   investigates (for example, software upgrades