Shouldn't the support for XOTcl and ttrace be in the XOTcl package itself? They already ship generic/aol-xotcl.tcl which overrides _ns_savenamespaces etc.
The dependency seems slightly backwards -- that naviserver should have to understand the guts of XOTcl, a non-required package. And keeping the support updated as new XOTcl packages are released...
