/usr/include/ is in libaccounts-qt5-dev 1.13+20150813-1.
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/usr/include/accounts-qt5/
/usr/include/accounts-qt5/Accounts/
/usr/include/accounts-qt5/Accounts/accountscommon.h
/usr/include/accounts-qt5/Accounts/Manager
/usr/include/accounts-qt5/Accounts/manager.h
/usr/include/accounts-qt5/Accounts/Account
/usr/include/accounts-qt5/Accounts/account.h
/usr/include/accounts-qt5/Accounts/AccountService
/usr/include/accounts-qt5/Accounts/account-service.h
/usr/include/accounts-qt5/Accounts/Application
/usr/include/accounts-qt5/Accounts/application.h
/usr/include/accounts-qt5/Accounts/AuthData
/usr/include/accounts-qt5/Accounts/auth-data.h
/usr/include/accounts-qt5/Accounts/Error
/usr/include/accounts-qt5/Accounts/error.h
/usr/include/accounts-qt5/Accounts/Provider
/usr/include/accounts-qt5/Accounts/provider.h
/usr/include/accounts-qt5/Accounts/Service
/usr/include/accounts-qt5/Accounts/service.h
/usr/include/accounts-qt5/Accounts/ServiceType
/usr/include/accounts-qt5/Accounts/service-type.h
/usr/include/accounts-qt5/Accounts/manager_p.h
/usr/include/accounts-qt5/Accounts/utils.h