Possible to use #include inside #if?

Would like to create a set of conditional statements where certain files are included if the statements are true:

<#if $somevalue == true>

<!-- myfile -->

<#inclulde "myfile.html">

<#else>

<!-- default -->

<#include "anotherfile.html">

</#if>

I'm seeing the commented HTML <!-- myfile --> but the include statement isn't returning the file. Any suggestions?

Thanks,

Patrick