Here is the breakage. I included the prior test log in case there was a dependency. checking prerequisite: TTY mkdir -p "$TRASH_DIRECTORY/prereq-test-dir-TTY" && ( cd "$TRASH_DIRECTORY/prereq-test-dir-TTY" && test_have_prereq PERL && # Reading from the pty master seems to get stuck _sometimes_ # on Mac OS X 10.5.0, using Perl 5.10.0 or 5.8.9. # # Reproduction recipe: run # # i=0 # while ./test-terminal.perl echo hi $i # do # : $((i = $i + 1)) # done # # After 2000 iterations or so it hangs. # https://rt.cpan.org/Ticket/Display.html?id=65692 # test "$(uname -s)" != Darwin && perl "$TEST_DIRECTORY"/test-terminal.perl \ sh -c "test -t 1 && test -t 2" ) + mkdir -p /home/randall/git/t/trash directory.t0021-conversion/prereq-test-dir-TTY + cd /home/randall/git/t/trash directory.t0021-conversion/prereq-test-dir-TTY + test_have_prereq PERL + uname -s + test NONSTOP_KERNEL != Darwin + perl /home/randall/git/t/test-terminal.perl sh -c test -t 1 && test -t 2 Can't locate IO/Pty.pm in @INC (you may need to install the IO::Pty module) (@INC contains: /usr/lib/perl5/site_perl/5.30.3/nonstop_kernel /usr/lib/perl5/site_perl/5.30.3 /usr/lib/perl5/5.30.3/nonstop_kernel /usr/lib/perl5/5.30.3 /usr/lib/perl5/site_perl) at /home/randall/git/t/test-terminal.perl line 5. BEGIN failed--compilation aborted at /home/randall/git/t/test-terminal.perl line 5. error: last command exited with $?=162 prerequisite TTY not satisfied ok 34 # skip delayed checkout shows progress by default on tty (pathspec checkout) (missing TTY of PERL,TTY) expecting success of 0021.35 'delayed checkout ommits progress on non-tty (pathspec checkout)': test_delayed_checkout_progress ! git checkout $opt + test_delayed_checkout_progress ! git checkout . test_delayed_checkout_progress: test: argument expected error: last command exited with $?=127 not ok 35 - delayed checkout ommits progress on non-tty (pathspec checkout) # # test_delayed_checkout_progress ! git checkout $opt # 1..35 -- Brief whoami: NonStop&UNIX developer since approximately UNIX(421664400) NonStop(211288444200000000) -- In real life, I talk too much.