There's an unconditional build requirement for pkgconfig(blues) in RHEL 7.8 strace spec file, but for DTS, the spec file is mostly inherited from upstream, where it's conditioned with "0%{?centos} >= 8 || 0%{?rhel} >= 8"; as a result, update from the system version to the DTS version may result in regression in Bluetooth-related decoding capabilities.
Testing notes: if Bluetooth address decoding is enabled, then tests/net-sockaddr.dir/exp and tests/net-sockaddr.dir/log contain lines with "sa_family=AF_BLUETOOTH".
Correction: the headers are needed only for tests after commit v4.23~160, so impact is not severe (no decoding regression, only lack of proper testing).
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHEA-2019:4135