/etc/snmp/snmpd.conf:
  file.managed:
    - source:
      - salt://packages/nagios/files/snmpd.conf.{{ grains['host'] }}
      - salt://packages/nagios/files/snmpd.conf.{{ env }}-{{ grains['server_role']|default('') }}
      - salt://packages/nagios/files/snmpd.conf.{{ grains['server_role']|default('') }}
      - salt://packages/nagios/files/snmpd.conf.{{ env }}
      - salt://packages/nagios/files/snmpd.conf
    - mode: 644
    - user: root
    - group: root
    - require:
      - pkg: net-snmp

gives the following error:

----------
    State: - file
    Name:      /etc/snmp/snmpd.conf
    Function:  managed
        Result:    False
        Comment:   The following requisites were not found:
                   require:
                       pkg: net-snmp

        Changes: