Warning: The package will not build sanely due to these errors:
Warning: This package description follows version 2.4 of the Cabal specification. This tool only supports up to version 2.3.0.0.
Warning: The following errors will cause portability problems on other environments:
Warning: These warnings may cause trouble when distributing the package:
Warning: In 'data-files': the pattern 'another-non-existent-directory/**/*.dat' attempts to match files in the directory 'another-non-existent-directory', but there is no directory by that name.
Warning: In 'extra-doc-files': the pattern 'non-existent-directory/*.html' attempts to match files in the directory 'non-existent-directory', but there is no directory by that name.
Warning: In 'extra-doc-files': the pattern 'present/present/missing/*.tex' attempts to match files in the directory 'present/present/missing', but there is no directory by that name.
Warning: The following errors will cause portability problems on other environments:
Warning: These warnings may cause trouble when distributing the package:
Warning: In 'data-files': the pattern 'non-existent-directory/*.dat' attempts to match files in the directory 'non-existent-directory', but there is no directory by that name.