Compilation of timezone source with zic fails (on mountpoint)

Hi,

During building of the ongoing PG updates (9.6.1, 9.5.5 to 9.1.24), we
found that the build failed for Linux on 9.3 and 9.2 with the following
error:
--
/bin/mkdir -p '/mnt/hgfs/pginstaller-repo/server/staging/linux/share/
postgresql'
./zic -d '/mnt/hgfs/pginstaller-repo/server/staging/linux/share/postgresql/timezone'
-p 'US/Eastern' ./data/africa ./data/antarctica ./data/asia
./data/australasia ./data/europe ./data/northamerica ./data/southamerica
./data/pacificnew ./data/etcetera ./data/factory ./data/backward
./data/systemv
warning: "./data/africa", line 159: symbolic link used because hard link
failed: Operation not permitted
warning: "./data/africa", line 160: symbolic link used because hard link
failed: Operation not permitted
....
....
warning: "./data/backward", line 125: symbolic link used because hard link
failed: Operation not permitted
.*/zic: link from
/mnt/hgfs/pginstaller-repo/**server/staging/linux/share/postgresql/timezone/US/Eastern
failed: Operation not permitted*
make[2]: *** [install] Error 1
--

On investigating, we found that it was because of the few commits in the
new updates related to zic.c which tries to create hard links. These hard
links failed to create on our build farm because we were building the
source on the mount point (/mnt/hgfs/) where hard links cannot be created.
The Linux machine is a Virtual Machine hosted on VMware Fusion on the Mac
Server and the Fusion doesn't allow to create hard links inside the shared
location. It errors out with "Operation not permitted". Symbolic links can
be created though.

On other build farm where we don't have VMs installed on Fusion, this error
is not seen.

--

--
Sandeep Thakkar