Beautytips module requires the excanvas library for Internet Explorer support. But it’s tricky getting drush_make to download and install the zipped version provided by the excanvas project because there’s no containing folder and drush_make seems to expect one. The obvious workaround is to pull it straight from the svn repo instead. Here’s what you need to tell drush_make:
; excanvas for beautytips IE support libraries[excanvas][download][type] = svn libraries[excanvas][download][url] = "http://explorercanvas.googlecode.com/svn/tags/m3" libraries[excanvas][directory_name] = "excanvas_r3" libraries[excanvas][destination] = "modules/beautytips/other_libs"