grep 2.5.1: two errors in 'make check'

[Patrick Smith]

I just built grep 2.5.1 on a PowerPC running Linux, and make check 
reported two errors.

The first report is

        Spencer test #55 failed
        FAIL: spencer1.sh

This test does

        echo - | grep -E -e '(*)b'

expecting exit code 1.  Instead, the exit code is 2 and grep prints this 
message:

        grep: Unmatched ) or \)

The second report is

        Options: Bond, test \#2 failed
        FAIL: backref.sh

This test does

        echo civic | grep -E -e \
           '^(.?)(.?)(.?)(.?)(.?)(.?)(.?)(.?)(.?).?\9\8\7\6\5\4\3\2\1$'

expecting exit code 0.  Instead, the exit code is 1, with no output.