diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -16,7 +16,7 @@
 option(PHONON_NO_CAPTURE "Disable the capture capabilities")
 option(PHONON_NO_DBUS "Deactivate DBus support (used to expose AudioOutputs and for deprecated runtime backend switching)" OFF)
 
-option(PHONON_BUILD_PHONON4QT5 "Build Phonon 4 transitional library for Qt5 (API compatible with regular Phonon4)" OFF)
+option(PHONON_BUILD_PHONON4QT5 "Build Phonon 4 transitional library for Qt5 (API compatible with regular Phonon4)" ON)
 
 # The following variables directly influence the library's soname version.
 # It is highly advised to think twice before changing those.
diff --git a/doc/Phonon4Qt5.dox b/doc/Phonon4Qt5.dox
--- a/doc/Phonon4Qt5.dox
+++ b/doc/Phonon4Qt5.dox
@@ -17,8 +17,8 @@
 
 \section phonon4qt5_building Building
 
-To build Phonon4Qt5 you will have to pass PHONON_BUILD_PHONON4QT5 to CMake to
-switch it into Qt5 build mode.
+Building Phonon in Qt5 mode is controlled by the CMake variable
+PHONON_BUILD_PHONON4QT5, which is enabled by default.
 
 Additionally if you are building against a qt-project provided binary build of Qt5
 you may have to define the CMAKE_PREFIX_PATH to make CMake find Qt5. If you are
@@ -30,7 +30,7 @@
 \verbatim
 mkdir build5
 cd build5
-cmake .. -DPHONON_BUILD_PHONON4QT5=ON -DCMAKE_PREFIX_PATH=/opt/Qt5.0.0/5.0.0/gcc_64 -DPHONON_INSTALL_QT_EXTENSIONS_INTO_SYSTEM_QT=ON
+cmake .. -DCMAKE_PREFIX_PATH=/opt/Qt5.0.0/5.0.0/gcc_64 -DPHONON_INSTALL_QT_EXTENSIONS_INTO_SYSTEM_QT=ON
 \endverbatim
 
 Phonon4Qt5 installation does not conflict with regular Phonon installations in
@@ -103,4 +103,4 @@
 }
 \endcode
 
-*/
\ No newline at end of file
+*/