jjww, if u access .../source, and everything is fine, then u are almost succ. post u lxr.conf here. and make sure u baseurl: http://localhost/lxr/http/
this baseurl is used to generate all reference.
no, that dbdir is ...$v/ so it will be dynamically changed.
u already have a 2.4.20. then u uncompress a 2.5.9 for example, then add a line as 2.5.9 in versions file, and run genxref and glimpse as what u did for 2.4.20. then ok.