I was trying to to generate some coverage reports in a fedora docker container and lcov just said that it can't find any coverage data. strace told me that it tries to use the find command and indeed, installing findutils made it work.
lcov-1.13-4.fc28 has been submitted as an update to Fedora 28. https://bodhi.fedoraproject.org/updates/FEDORA-2018-504ce49143
lcov-1.13-4.fc28 has been pushed to the Fedora 28 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2018-504ce49143
lcov-1.13-4.fc28 has been pushed to the Fedora 28 stable repository. If problems still persist, please make note of it in this bug report.