As discussed on IRC on Tue Mar 8, when using Truecrypt in text mode interactively, prompts are invisible due to glibcisms leading to missing flushing of messages written to terminal.

(from redmine: issue id 6992, created on 2017-03-09, closed on 2017-04-07)

• Changesets:
  • Revision 0c1e8d47 by Timo Teräs on 2017-03-10T12:18:19Z:

main/truecrypt: flush stdout before reading stdin

stdout is line-buffered, and needs to be flushed explicitly
in musl. fixes #6992