Trouble installing postgresql server on Amazon Linux

[Augori <augori@xxxxxxxxx>]

Hello,

I'm trying to install postgresql on an Amazon Linux AMI release 2015.09.  I got the rpm for Amazon Linux AMI 2015.03 - x86_64 under PostgreSQL 9.3 linked here:

http://yum.postgresql.org/repopackages.php

But a yum install  complains that it requires systemd-units, which I haven't figure out how to get.  The yum command and result:

]# yum -y install postgresql93 postgresql93-server postgresql93-contrib postgresql93-libs
Loaded plugins: priorities, update-motd, upgrade-helper
Repository pgdg93 is listed more than once in the configuration
Repository pgdg93-source is listed more than once in the configuration
8 packages excluded due to repository priority protections
Resolving Dependencies
--> Running transaction check
---> Package postgresql93.x86_64 0:9.3.10-1PGDG.rhel7 will be installed
---> Package postgresql93-contrib.x86_64 0:9.3.10-1PGDG.rhel7 will be installed
---> Package postgresql93-libs.x86_64 0:9.3.10-1PGDG.rhel7 will be installed
---> Package postgresql93-server.x86_64 0:9.3.10-1PGDG.rhel7 will be installed
--> Processing Dependency: systemd-units for package: postgresql93-server-9.3.10-1PGDG.rhel7.x86_64
--> Processing Dependency: systemd-units for package: postgresql93-server-9.3.10-1PGDG.rhel7.x86_64
--> Finished Dependency Resolution
Error: Package: postgresql93-server-9.3.10-1PGDG.rhel7.x86_64 (pgdg93)
           Requires: systemd-units
 You could try using --skip-broken to work around the problem
 You could try running: rpm -Va --nofiles --nodigest

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The --skip-broken option returns Errno 256
# yum -y install --skip-broken postgresql93 postgresql93-server postgresql93-contrib postgresql93-libs
.
.
.
Error downloading packages:
  postgresql93-contrib-9.3.10-1PGDG.rhel7.x86_64: failure: postgresql93-contrib-9.3.10-1PGDG.rhel7.x86_64.rpm from pgdg93: [Errno 256] No more mirrors to try.
  postgresql93-9.3.10-1PGDG.rhel7.x86_64: failure: postgresql93-9.3.10-1PGDG.rhel7.x86_64.rpm from pgdg93: [Errno 256] No more mirrors to try.
  postgresql93-libs-9.3.10-1PGDG.rhel7.x86_64: failure: postgresql93-libs-9.3.10-1PGDG.rhel7.x86_64.rpm from pgdg93: [Errno 256] No more mirrors to try.


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I've tried quite a few other things, but now I'm back to the same error.  Do you have any suggestions?

Thank you,

Augori