The current pandoc in our repos has minimal support for citations, in that only the native markdown format is understood. Extending this to cover most other bibliography formats (including BibTeX) would complete pandoc's feature set.

In fact, it is assumed by both pandoc and citeproc-hs that this would be default. As such, only a rebuild against the relevant dependencies (while adding them to the dep list) is what is required for this. The said deps are in AUR:

haskell-hs-bibutils + bibutils-dynamic

And the rebuild process would look like this:

bibutils-dynamic (new) -> haskell-hs-bibutils (new) -> citeproc-hs (dep on hs-bibutils) -> haskell-pandoc (no change)

To check, run the following on the attached sample files:

pandoc test.md -o test.pdf --biblio test.bib

If there was no output from the command line, then all is well, it worked. You may also view the output PDF and see that the citation "(Doe 1991)" is there.