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* src/factor.c (lbuf_putc): Use line buffered mode if the standard output is a terminal in the same way as the stdio library. User programs might use pty only for the standard out like the example of Ruby's PTY module: https://docs.ruby-lang.org/en/2.6.0/PTY.html#module-PTY-label-Example * NEWS: Mention the fix. Fixes https://bugs.gnu.orv/35046