because, eg for http://packages.gentoo.org/ebuilds/?vanilla-prepatch-sources-2.4.24_pre1 the home page is "http://www.kernel.org/ http://www.gentoo.org/" which is wrong.
To be more clearly, the 2 entries should be separated in that way that it is possible to click on an URL. In moment a browser gives an error like: "http://www.kernel.org/ http://www.gentoo.org/" NOT FOUND
seems to be resolved