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harfbuzz is text sharpening library, freetype is a font engine...and right now they have a circular dependency problem. Harfbuzz uses some parts of freetype and needs to link against freetype...and in the normal case freetype makes use of harfbuzz for better looking fonts. Only way to solve this right now is doing a freetype build without harfbuzz support, then building harfbuzz...then rebuilding freetype again, this time with harfbuzz support.
Easier example...sphinx is a document generator for python programs (creating docs for the API of programs from source-code comments for example). Spinx depends on html5lib which itself again depends on six...want to make a guess what six uses to generate its API docs? ;) So if you want the api docs of six you will have to first install it without to be able to get a working sphinx install then redo the six on including the building of the API docs.
Easier example...sphinx is a document generator for python programs (creating docs for the API of programs from source-code comments for example). Spinx depends on html5lib which itself again depends on six...want to make a guess what six uses to generate its API docs? ;) So if you want the api docs of six you will have to first install it without to be able to get a working sphinx install then redo the six on including the building of the API docs.