Dear Gzip maintainers,

I am trying to build GNU Gzip 1.9.10-051e (bootstrapped from the Git 
repository) on a Mac OS machine. But I got several compilation errors 
that are shown in the attached file. I would appreciate any thoughts on 
fixing them.

Here is some basic information on the operating system and GCC version.

$ uname -a
Darwin Y.local 15.6.0 Darwin Kernel Version 15.6.0: Mon Nov 13 21:58:35 PST
2017; root:xnu-3248.72.11~1/RELEASE_X86_64 x86_64

$ gcc --version
gcc (MacPorts gcc49 4.9.4_0) 4.9.4
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Thank you very much for all the great work on GNU Gzip,
Cheers,
Mohammad