Description of problem: No matching package to install: 'pkgconfig(Qt5Declarative)' Version-Release number of selected component (if applicable): qt5-qtdeclarative-5.7.1-7.fc26 qt5-qtdeclarative-5.9.0-2.fc27 How reproducible: yes Steps to Reproduce: 1. BuildRequires: pkgconfig(Qt5Declarative) 2. 3. Actual results: No matching package to install: 'pkgconfig(Qt5Declarative)' Expected results: qt5-qtdeclarative-devel gets installed by help from pkgconfig magic. Additional info: Why "drop pkgconfig-style deps (for now)"? http://pkgs.fedoraproject.org/cgit/rpms/qt5-qtdeclarative.git/commit/?id=6cbfe6cca085a378afcf9aa9816d598e53463829
You need pkgconfig(Qt5Quick) here, naming is confusing…
qt5-qtquick1 is deprecated/retired, no longer supported. In fact, we had to retire it because it currently FTBFS against latest qt-5.9
See also mailing list topic, https://lists.fedoraproject.org/archives/list/kde@lists.fedoraproject.org/thread/CMGWYSGGHZWMPIP7IOEQLEFAE5OCI2Z6/