diff --git a/config.pri b/config.pri
index 0002840a..2605dadd 100644
--- a/config.pri
+++ b/config.pri
@@ -1,8 +1,8 @@
-#functions to automatically initialize some of YACReader's build options to
-#default values if they're not set on build time
-#for a more detailed description, see INSTALL.TXT
+# functions to automatically initialize some of YACReader's build options to
+# default values if they're not set on build time
+# for a more detailed description, see INSTALL.TXT
 
-#check Qt version
+# check Qt version
 QT_VERSION = $$[QT_VERSION]
 QT_VERSION = $$split(QT_VERSION, ".")
 QT_VER_MAJ = $$member(QT_VERSION, 0)
@@ -11,12 +11,16 @@ QT_VER_MIN = $$member(QT_VERSION, 1)
 lessThan(QT_VER_MAJ, 5) {
 error(YACReader requires Qt 5 or newer but Qt $$[QT_VERSION] was detected.)
   }
-lessThan(QT_VER_MIN, 4):!CONFIG(no_opengl)	{
-  CONFIG += legacy_gl_widget
-  message ("Qt < 5.4 detected. Using QGLWidget for coverflow.")
+lessThan(QT_VER_MIN, 6) {
+  warning ("Qt < 5.6 detected. Compilation will probably work, but some qml based components in YACReaderLibrary (GridView, InfoView) will fail at runtime.")
   }
-lessThan(QT_VER_MIN, 3){
-  error ("You need at least Qt 5.3 to build YACReader or YACReaderLibrary")
+lessThan(QT_VER_MIN, 4):!CONFIG(no_opengl) {
+  CONFIG += legacy_gl_widget
+  warning ("Qt < 5.4 detected. Using QGLWidget for coverflow.")
+  warning ("QGLWidget based coverflow is scheduled for removal.")
+  }
+lessThan(QT_VER_MIN, 3) {
+  error ("You need at least Qt 5.3 to compile YACReader or YACReaderLibrary.")
   }
 
 #build without opengl widget support
@@ -24,17 +28,12 @@ CONFIG(no_opengl) {
   DEFINES += NO_OPENGL
 }
 
-#default values for decompression backends
+# default value for comic archive decompression backend
 !CONFIG(unarr):!CONFIG(7zip) {
-  unix {
-    CONFIG += unarr
-  }
-  win32 {
-    CONFIG += unarr
-  }
+  CONFIG += unarr
 }
 
-#default values for pdf render backend
+# default values for pdf render backend
 win32:!CONFIG(poppler):!CONFIG(pdfium):!CONFIG(no_pdf) {
   CONFIG += pdfium
 }