I'm working on a PowerMac G5 running OS X 10.5. Two self tests fail
when running `make check`.

$ make check
...
make[4]: Entering directory `/Users/scripts/gzip-1.8/tests'
PASS: gzip-env
PASS: helin-segv
FAIL: help-version
PASS: hufts
PASS: keep
PASS: list
PASS: memcpy-abuse
PASS: mixed
PASS: null-suffix-clobber
PASS: stdin
PASS: trailing-nul
PASS: unpack-invalid
PASS: z-suffix
PASS: zdiff
FAIL: zgrep-f
PASS: zgrep-context
PASS: zgrep-signal
PASS: znew-k
====================================
   gzip 1.8: tests/test-suite.log
====================================