use %_qt5_archdatadir/mkspecs

qwt.spec

@@ -8,7 +8,7 @@
 Name:    qwt
 Summary: Qt Widgets for Technical Applications
 Version: 6.1.3
-Release: 8%{?dist}
+Release: 9%{?dist}
 
 License: LGPLv2 with exceptions
 URL:     http://qwt.sourceforge.net
@@ -175,13 +175,16 @@ cp -alf %{buildroot}%{_qt4_docdir}/html/qwt/ \
 %{_qt5_headerdir}/qwt/
 %{_qt5_libdir}/libqwt-qt5.so
 %{_qt5_libdir}/libqwtmathml-qt5.so
-%{_qt5_libdir}/qt5/mkspecs/features/qwt*
+%{_qt5_archdatadir}/mkspecs/features/qwt*
 %{_qt5_libdir}/pkgconfig/Qt5Qwt6.pc
 %{_qt5_libdir}/pkgconfig/qwtmathml-qt5.pc
 %endif
 
 
 %changelog
+* Tue Jul 24 2018 Rex Dieter <rdieter@fedoraproject.org> - 6.1.3-9
+- use %%_qt5_archdatadir/mkspecs
+
 * Sat Jul 14 2018 Fedora Release Engineering <releng@fedoraproject.org> - 6.1.3-8
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_29_Mass_Rebuild