/usr/include/freeipmi/spec/ is in libfreeipmi-dev 0.8.12-3ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/freeipmi/spec/ipmi-authentication-type-spec.h
/usr/include/freeipmi/spec/ipmi-channel-spec.h
/usr/include/freeipmi/spec/ipmi-chassis-boot-options-parameter-oem-spec.h
/usr/include/freeipmi/spec/ipmi-chassis-boot-options-parameter-spec.h
/usr/include/freeipmi/spec/ipmi-cmd-dcmi-spec.h
/usr/include/freeipmi/spec/ipmi-cmd-oem-spec.h
/usr/include/freeipmi/spec/ipmi-cmd-spec.h
/usr/include/freeipmi/spec/ipmi-comp-code-dcmi-spec.h
/usr/include/freeipmi/spec/ipmi-comp-code-oem-spec.h
/usr/include/freeipmi/spec/ipmi-comp-code-spec.h
/usr/include/freeipmi/spec/ipmi-device-types-oem-spec.h
/usr/include/freeipmi/spec/ipmi-device-types-spec.h
/usr/include/freeipmi/spec/ipmi-entity-ids-spec.h
/usr/include/freeipmi/spec/ipmi-event-reading-type-code-oem-spec.h
/usr/include/freeipmi/spec/ipmi-event-reading-type-code-spec.h
/usr/include/freeipmi/spec/ipmi-fru-chassis-types-spec.h
/usr/include/freeipmi/spec/ipmi-fru-language-codes-spec.h
/usr/include/freeipmi/spec/ipmi-iana-enterprise-numbers-spec.h
/usr/include/freeipmi/spec/ipmi-ipmb-lun-spec.h
/usr/include/freeipmi/spec/ipmi-lan-parameter-oem-spec.h
/usr/include/freeipmi/spec/ipmi-lan-parameter-spec.h
/usr/include/freeipmi/spec/ipmi-netfn-oem-spec.h
/usr/include/freeipmi/spec/ipmi-netfn-spec.h
/usr/include/freeipmi/spec/ipmi-pef-parameter-oem-spec.h
/usr/include/freeipmi/spec/ipmi-pef-parameter-spec.h
/usr/include/freeipmi/spec/ipmi-privilege-level-spec.h
/usr/include/freeipmi/spec/ipmi-product-id-spec.h
/usr/include/freeipmi/spec/ipmi-rmcpplus-status-spec.h
/usr/include/freeipmi/spec/ipmi-sensor-and-event-code-tables-oem-spec.h
/usr/include/freeipmi/spec/ipmi-sensor-and-event-code-tables-spec.h
/usr/include/freeipmi/spec/ipmi-sensor-numbers-oem-spec.h
/usr/include/freeipmi/spec/ipmi-sensor-types-oem-spec.h
/usr/include/freeipmi/spec/ipmi-sensor-types-spec.h
/usr/include/freeipmi/spec/ipmi-sensor-units-spec.h
/usr/include/freeipmi/spec/ipmi-serial-modem-parameter-oem-spec.h
/usr/include/freeipmi/spec/ipmi-serial-modem-parameter-spec.h
/usr/include/freeipmi/spec/ipmi-slave-address-oem-spec.h
/usr/include/freeipmi/spec/ipmi-slave-address-spec.h
/usr/include/freeipmi/spec/ipmi-sol-parameter-oem-spec.h
/usr/include/freeipmi/spec/ipmi-sol-parameter-spec.h
/usr/include/freeipmi/spec/ipmi-system-info-parameter-oem-spec.h
/usr/include/freeipmi/spec/ipmi-system-info-parameter-spec.h
/usr/include/freeipmi/spec/ipmi-system-software-id-spec.h