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I might be missing something pretty simple, but I feel the need to finally understand the whole thing. I have some (limited) experience of component creation in D7 (a few simple GUI controls), but I have trouble doing the job in D12. I create a DPK with a new component derived from TCustomControl and install the package. Then I start a new project and put an instance of the control onto the form. It works in design-time (like, say, repaints correctly when changing the inherited Color property from the Object Inspector) but when I try to compile the program, I get a “file not found” error pointing to a .pas with the control. Google says one might manually add an appropriate folder to the Library path in IDE, but I feel there should be a way to make IDE do it automatically on component (package) installation. At least I can’t remember having the same trouble with D7. Can anyone point me to or provide a good explanation (related to paths and stuff) of the whole ecosystem and best practices? (Information on D12 IDE some-level-support for 64-bit components is also appreciated.)