The printf builtin "%(fmt)T" specifier (which allows time values
to use strftime-like formatting) is introduced in bash 4.2.

Trying to execute this in pre-4.2 bash will fail -- and if this
happens execute the fallback piece of perl code to do the same thing.
---
 test/test-lib.sh | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/test/test-lib.sh b/test/test-lib.sh
index 78af170..a1c0f27 100644
--- a/test/test-lib.sh
+++ b/test/test-lib.sh
@@ -374,8 +374,12 @@ generate_message ()
        # we use decreasing timestamps here for historical reasons;
        # the existing test suite when we converted to unique timestamps just
        # happened to have signicantly fewer failures with that choice.
-       template[date]=$(TZ=UTC printf "%(%a, %d %b %Y %T %z)T\n" \
-                       $((978709437 - gen_msg_cnt)))
+       local date_secs=$((978709437 - gen_msg_cnt))
+       # printf %(..)T is bash 4.2+ feature. use perl fallback if needed...
+       TZ=UTC printf -v template[date] "%(%a, %d %b %Y %T %z)T" $date_secs 
2>/dev/null ||
+           template[date]=`perl -le 'use POSIX "strftime";
+                               @time = gmtime '"$date_secs"';
+                               print strftime "%a, %d %b %Y %T +0000", @time'`
     fi

     additional_headers=""
-- 
1.8.0

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