diff -Naur kchmviewer-7.7.orig/src/src.pro kchmviewer-7.7/src/src.pro
--- kchmviewer-7.7.orig/src/src.pro	2016-10-05 09:35:34.149265000 +0200
+++ kchmviewer-7.7/src/src.pro	2017-02-07 15:16:27.749908883 +0100
@@ -114,20 +114,10 @@
 
 greaterThan(QT_MAJOR_VERSION, 4) {
     # Qt 5
-    greaterThan(QT_MINOR_VERSION, 5) {
-        # Qt 5.6+
-        error("You use Qt5.6+ - QWebEngine is not yet suitable for kchmviewer and is not supported")
-        QT += webengine webenginewidgets
-        DEFINES += USE_WEBENGINE
-        SOURCES += viewwindow_webengine.cpp dataprovider_qwebengine.cpp
-        HEADERS += dataprovider_qwebengine.h viewwindow_webengine.h
-    } else {
-        # Qt 5.0-5.5
         QT += webkit webkitwidgets
         DEFINES += USE_WEBKIT
         SOURCES += viewwindow_webkit.cpp dataprovider_qwebkit.cpp
         HEADERS += dataprovider_qwebkit.h viewwindow_webkit.h
-    }
 } else {
     message("Qt4 is not supported anymore, please do not report any errors")
     QT += webkit webkitwidgets