Fix documentation building on Qt5

doc/doc.pri

-QDOC = qdoc3
+equals(QT_MAJOR_VERSION, 4): QDOC = qdoc3
+equals(QT_MAJOR_VERSION, 5): QDOC = qdoc
 QHELPGENERATOR = qhelpgenerator
-QDOCCONF = doc/config/transfer-engine-project.qdocconf
+equals(QT_MAJOR_VERSION, 4): QDOCCONF = doc/config/transfer-engine-project.qdocconf
+equals(QT_MAJOR_VERSION, 5): QDOCCONF = transfer-engine-project.qdocconf
 QHELPFILE = doc/html/transferengine.qhp
 QCHFILE = doc/html/transferengine.qch
 
-docs.commands = ($$QDOC $$QDOCCONF) && \
+equals(QT_MAJOR_VERSION, 4): docs.commands = ($$QDOC $$QDOCCONF) && \
+                ($$QHELPGENERATOR $$QHELPFILE -o $$QCHFILE)
+equals(QT_MAJOR_VERSION, 5): docs.commands = (cd doc/config; $$QDOC $$QDOCCONF; cd ../..) && \
                 ($$QHELPGENERATOR $$QHELPFILE -o $$QCHFILE)
 
 QMAKE_EXTRA_TARGETS += docs

doc/html/.gitignore

 *html
 *index*
+*.qch
+*.qhp*
+*.tags

rpm/transfer-engine-qt5.spec

@@ -15,6 +15,9 @@ BuildRequires: desktop-file-utils
 BuildRequires: pkgconfig(mlite5)
 BuildRequires: pkgconfig(quillmetadata-qt5)
 BuildRequires: qt5-qttools-linguist
+BuildRequires: qt5-qttools-qthelp-devel
+BuildRequires: qt5-plugin-platform-minimal
+BuildRequires: qt5-plugin-sqldriver-sqlite
 
 %description
 %{summary}.