libnotmuch-dev 0.25.3-1ubuntu1 (ppc64el binary) in ubuntu bionic

 Notmuch is a system for indexing, searching, reading, and tagging
 large collections of email messages in maildir or mh format. It uses
 the Xapian library to provide fast, full-text search with a very
 convenient search syntax.
 .
 This package provides the necessary development libraries and header
 files to allow you to develop new software using libnotmuch.