Install this package:
emerge -a app-text/pandoc
If the package is masked, you can unmask it using the autounmask tool or standard emerge options:
autounmask
emerge
autounmask app-text/pandoc
Or alternatively:
emerge --autounmask-write -a app-text/pandoc
<pkgmetadata> <maintainer type="project"> <email>haskell@gentoo.org</email> </maintainer> </pkgmetadata>