This should work hopefully.

inventory/group_vars/all

@@ -3,6 +3,10 @@ freezes: true
 # most of our systems are in phx2
 datacenter: phx2
 
+# most of our systems are 64bit. 
+# Used to install various nagios scripts and the like.
+libdir: /usr/lib64
+
 # example of ports for default iptables
 # tcp_ports: [ 22, 80, 443 ]
 # udp_ports: [ 110, 1024, 2049 ]

inventory/group_vars/arm-releng

@@ -1,4 +1,7 @@
 ---
 fas_client_groups: sysadmin-releng
 freezes: false
+#
+# These are 32bit
+#
 libdir: /usr/lib

vars/global.yml

@@ -10,7 +10,6 @@ tasks: /srv/web/infra/ansible/tasks
 vars:  /srv/web/infra/ansible/vars
 is_fedora: "'$ansible_distribution' == 'Fedora'"                      
 is_rhel:   "'$ansible_distribution' == 'RedHat'"
-libdir: /usr/lib64
 dist_tag: unknown
 auth_keys_from_fas: '/srv/web/infra/ansible/scripts/auth-keys-from-fas'
 el6_qcow_id: ami-00000013