/usr/include/libinfinity-0.6/libinfinity/common/ is in libinfinity-0.6-dev 0.6.7-1build1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/libinfinity-0.6/libinfinity/common/inf-acl.h
/usr/include/libinfinity-0.6/libinfinity/common/inf-async-operation.h
/usr/include/libinfinity-0.6/libinfinity/common/inf-browser-iter.h
/usr/include/libinfinity-0.6/libinfinity/common/inf-browser.h
/usr/include/libinfinity-0.6/libinfinity/common/inf-buffer.h
/usr/include/libinfinity-0.6/libinfinity/common/inf-cert-util.h
/usr/include/libinfinity-0.6/libinfinity/common/inf-certificate-chain.h
/usr/include/libinfinity-0.6/libinfinity/common/inf-certificate-credentials.h
/usr/include/libinfinity-0.6/libinfinity/common/inf-chat-buffer.h
/usr/include/libinfinity-0.6/libinfinity/common/inf-chat-session.h
/usr/include/libinfinity-0.6/libinfinity/common/inf-discovery-avahi.h
/usr/include/libinfinity-0.6/libinfinity/common/inf-discovery.h
/usr/include/libinfinity-0.6/libinfinity/common/inf-error.h
/usr/include/libinfinity-0.6/libinfinity/common/inf-file-util.h
/usr/include/libinfinity-0.6/libinfinity/common/inf-init.h
/usr/include/libinfinity-0.6/libinfinity/common/inf-io.h
/usr/include/libinfinity-0.6/libinfinity/common/inf-ip-address.h
/usr/include/libinfinity-0.6/libinfinity/common/inf-local-publisher.h
/usr/include/libinfinity-0.6/libinfinity/common/inf-name-resolver.h
/usr/include/libinfinity-0.6/libinfinity/common/inf-native-socket.h
/usr/include/libinfinity-0.6/libinfinity/common/inf-protocol.h
/usr/include/libinfinity-0.6/libinfinity/common/inf-request-result.h
/usr/include/libinfinity-0.6/libinfinity/common/inf-request.h
/usr/include/libinfinity-0.6/libinfinity/common/inf-sasl-context.h
/usr/include/libinfinity-0.6/libinfinity/common/inf-session-proxy.h
/usr/include/libinfinity-0.6/libinfinity/common/inf-session.h
/usr/include/libinfinity-0.6/libinfinity/common/inf-simulated-connection.h
/usr/include/libinfinity-0.6/libinfinity/common/inf-standalone-io.h
/usr/include/libinfinity-0.6/libinfinity/common/inf-tcp-connection.h
/usr/include/libinfinity-0.6/libinfinity/common/inf-user-table.h
/usr/include/libinfinity-0.6/libinfinity/common/inf-user.h
/usr/include/libinfinity-0.6/libinfinity/common/inf-xml-connection.h
/usr/include/libinfinity-0.6/libinfinity/common/inf-xml-util.h
/usr/include/libinfinity-0.6/libinfinity/common/inf-xmpp-connection.h
/usr/include/libinfinity-0.6/libinfinity/common/inf-xmpp-manager.h