zgrep bug

[midair]

version='zgrep (gzip) 1.3.12

cksum /opt/exp/gnu/bin/zgrep

3472675934  4902


>> zgrep
/opt/exp/gnu/bin/zgrep: syntax error at line 61: `(' unexpected
>> zgrep --help
/opt/gnu/bin/zgrep: syntax error at line 61: `(' unexpected