Fix conservative upgrades.
Add compatibility shims and basic Mac OS X build fixes.
Initial adoption of OS X compatibility shims.
Initial adoption of OS X compatibility shims.
Include fstatat() shim.
Use compatibility shims for humanize_number()
Use compatibility shims for strtonum().
Remove unnecessary reference to AT_FDCWD.
Additional OS X portability fixes.
Add OpenSSH's closefrom() replacement implementation.
Enable use of closefrom() and eaccess() shims.
Add faccessat() and freadlinkat() compatibility shims.
Add FreeBSD's endian utils.
Use bsd_compat.h to provide faccessat().
Replace incorrect to builddir with srcdir.
Fix portable build of test suite.
Remove unused variable.

It's not clear how to return the number of conflicts.  Always return 0
upon success, let's not call it the number of conflicts.
Disable building of elf-specific code on Mach-O systems.

The only Mach-O system supported is Darwin.
Add a stub Mach-O implementation.
1.4.99.1