Install libraries to the correct directory.                                                                                                                                                                        

Gentoo-bug: 562624
Gentoo-bug: 570976
Gentoo-bug: 576946

--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -159,7 +159,7 @@
   endif (BUILD_KDE_APP OR BUILD_SHARED_LIBS)
   set(WITH_QMLDIR_DEFAULT "share/kid3/qml")
   set(WITH_BINDIR_DEFAULT "bin")
-  set(WITH_LIBDIR_DEFAULT "lib${LIB_SUFFIX}/kid3")
+  set(WITH_LIBDIR_DEFAULT "lib${LIB_SUFFIX}")
   set(WITH_PLUGINSDIR_DEFAULT "${WITH_LIBDIR_DEFAULT}/plugins")
 endif (APPLE)
 
@@ -189,6 +189,10 @@
   set(CMAKE_INSTALL_PREFIX_SLASH "")
 endif (CMAKE_INSTALL_PREFIX)
 
+if (NOT APPLE AND NOT WIN32)
+  set(WITH_PLUGINSDIR "${WITH_LIBDIR_DEFAULT}/${QTVER}/plugins/kid3")
+endif ()
+
 if (APPLE)
 file(RELATIVE_PATH CFG_DATAROOTDIR "/kid3.app/Contents/MacOS" /${WITH_DATAROOTDIR})
 file(RELATIVE_PATH CFG_DOCDIR "/kid3.app/Contents/MacOS" /${WITH_DOCDIR})
@@ -241,6 +245,7 @@
   find_package(Qt4 COMPONENTS ${_QT4_COMPONENTS})
   if (Qt4_FOUND OR QT4_FOUND)
     include (${QT_USE_FILE})
+    set(QTVER "qt4")
     if (NOT WITH_QT4)
       message(STATUS "Qt4 found, explicitly set WITH_QT5 or QT_QMAKE_EXECUTABLE to use a different version.")
     endif (NOT WITH_QT4)
@@ -276,6 +281,7 @@
   endif (_qt5Dir)
   if (Qt5Core_FOUND)
     set(HAVE_QT5 1)
+    set(QTVER "qt5")
     set(WITH_PHONON OFF)
     set(QT_INCLUDES)
     set(QT_DEFINITIONS)