Stuff here

<TMPL_IF NAME="NEED_INCLUDE_1">
  <TMPL_INCLUDE NAME="INCLUDE_1">
</TMPL_IF>
<TMPL_IF NAME="NEED_INCLUDE_2">
  <TMPL_INCLUDE NAME="INCLUDE_2">
</TMPL_IF>

- or with HTML::Template::Expr -

<TMPL_IF EXPR="DYNAMIC_INCLUDE eq 'include_file_1.tmpl'">
  <TMPL_INCLUDE NAME="include_file_1.tmpl">
</TMPL_IF>

Stuff here