Here's the error:
>>> emerge (1 of 1) sys-apps/gawk-3.1.3-r1 to /
>>> md5 src_uri ;-) gawk-3.1.3.tar.gz
>>> Checking gawk-3.1.3.tar.gz's mtime...
>>> Not marked as unpacked; recreating WORKDIR...
>>> Unpacking source...
>>> Unpacking gawk-3.1.3.tar.gz to /var/tmp/portage/gawk-3.1.3-r1/work
cp: illegal option -- d
usage: cp [-R [-H | -L | -P]] [-f | -i | -n] [-pv] src target
cp [-R [-H | -L | -P]] [-f | -i | -n] [-pv] src1 ... srcN directory
!!! ERROR: sys-apps/gawk-3.1.3-r1 failed.
!!! Function src_unpack, Line 24, Exitcode 64
!!! cp failed
!!! If you need support, post the topmost build error, NOT this status message.
This looks like a cp incompatibility. The equivalent option on macos is "-P" (don't follow symlinks/no-reference). I believe this is also the POSIX standard option and the gnu utils are changing to -P instead of -d, so maybe the ebuild can just be changed to "cp -PR" instead of "cp -dR"?
In CVS.
Thank you for your report, if you sync in two hours, the updated ebuild will be in your tree.