I had this specific problem with Class::MethodMaker as well. Perhaps because I had my files inside of subdirs (e.g. My::Module in My/Module.pm), Steffen's fix didn't work. I had to take another step, and make sure I had the filename just so:

BEGIN { use strict; use File::Spec; $INC{"My/Module.pm"} ||= File::Spe
+c->rel2abs(__FILE__); }
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(OK, the "use strict" is just a bit of belt-and-suspenders ;)