Has anyone else noticed that some variables disappear into the ether
under PREFIX?  One example is ebuilds that inherit webapp.eclass,
we've had to add an extra "webapp_read_config" to the
webapp_src_preinst function, otherwise the variables aren't set...
ie:

function webapp_src_preinst ()
{
        # create the directories that we need

        dodir "${MY_HTDOCSDIR}"
        dodir "${MY_HOSTROOTDIR}"
        dodir "${MY_CGIBINDIR}"
        dodir "${MY_ICONSDIR}"
        dodir "${MY_ERRORSDIR}"
        dodir "${MY_SQLSCRIPTSDIR}"
        dodir "${MY_HOOKSCRIPTSDIR}"
        dodir "${MY_SERVERCONFIGDIR}"
}

has to be changed to:
function webapp_src_preinst ()
{
    # =-=  for some reason, we need to re-source variables
        webapp_read_config

        # create the directories that we need

        dodir "${MY_HTDOCSDIR}"
        dodir "${MY_HOSTROOTDIR}"
        dodir "${MY_CGIBINDIR}"
        dodir "${MY_ICONSDIR}"
        dodir "${MY_ERRORSDIR}"
        dodir "${MY_SQLSCRIPTSDIR}"
        dodir "${MY_HOOKSCRIPTSDIR}"
        dodir "${MY_SERVERCONFIGDIR}"
}
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