# 6.6.0.0

  - Import Bibutils 6.6.

  - Expose NBIB output support.

# 6.5.0.0

  - Import Bibutils 6.5.

# 6.4.0.0

  - Import Bibutils 6.4.

# 6.3.0.1

  - Fix MacOS X compilation.

# 6.3.0.0

  - Update to Bibutils 6.3.

  - Enable NBIB support.

  - Expose additional options values.

# 6.2.0.1

  - This is a patch release fixing MacOS X compilation.

  - Patched few minor warnings in imported Bibutils source.

  - Implemented Travis-CI builds through Cabal and Stack.

# 6.2

  - This release has removed `wordout_dropkey` because the corresponding

    constant in Bibutils has also been removed.