Originally reported by:jaraco (Bitbucket:jaraco, GitHub:jaraco)

Insvg.charts, an issue was reported that the package fails to install [on Unix systems] because it tries to open 'readme.txt', but the file is named 'README.txt'. However, you can see from thesource repo that the file is clearly named 'readme.txt'.

Looking at the setuptools sdist source, it seems that it's matching the name by existence, but not actually reflecting the name of the file as it appears in the file system. This has the effect of essentially causing the file to be renamed as it is added to the sdist.

Setuptools should match the case of the filename as it is found in the system.

• Bitbucket:https://bitbucket.org/pypa/setuptools/issue/100