I've been working away on porting to gmime 3.0 [1]; currently more than 50 tests fail, at least some of which due to [2]. I've also found a few bugs in notmuch: We currently use GmimeFileStream to output to stdout, but this assumes the underlying file descriptor is seekable; the seek errors are masked in gmime 2.6 but not in gmime 3.0 [PATCH 1/5] util: convenience function to create gmime stream for [PATCH 2/5] cli/reply: direct all output for text format to gmime [PATCH 3/5] cli/show: use single stream for printf / gmime object There is also memory leak in notmuch reply; because notmuch-reply doesn't run for a long time, the practical impact is low. The first patch is just so we have some way of verifying the fix. It seems a bit heavy to start using valgrind in the main test suite. [1]: http://pivot.cs.unb.ca/git?p=notmuch.git;a=shortlog;h=refs/heads/gmime-3.0 [2]: https://bugzilla.gnome.org/show_bug.cgi?id=782915