yarock_aur

1) my packages:
extra/qt5-base 5.4.1-9 (qt qt5)
extra/qt5-declarative 5.4.1-9 (qt qt5)
extra/qt5-graphicaleffects 5.4.1-9 (qt qt5)
extra/qt5-imageformats 5.4.1-9 (qt qt5)
extra/qt5-location 5.4.1-9 (qt qt5)
extra/qt5-multimedia 5.4.1-9 (qt qt5)
extra/qt5-quickcontrols 5.4.1-9 (qt qt5)
extra/qt5-script 5.4.1-9 (qt qt5)
extra/qt5-sensors 5.4.1-9 (qt qt5)
extra/qt5-svg 5.4.1-9 (qt qt5)
extra/qt5-tools 5.4.1-9 (qt qt5)
extra/qt5-translations 5.4.1-9 (qt qt5)
extra/qt5-webchannel 5.4.1-9 (qt qt5)
extra/qt5-webkit 5.4.1-9 (qt qt5)
extra/qt5-x11extras 5.4.1-9 (qt qt5)
extra/qt5-xmlpatterns 5.4.1-9 (qt qt5)
extra/phonon-qt4 4.8.3-2
extra/phonon-qt4-gstreamer 4.8.2-1
extra/phonon-qt5-gstreamer 4.8.2-1
extra/phonon-qt5 4.8.3-2

2)I change your PKGBUILD to:

prepare() {
  patch -p0 -i "${srcdir}/phonon.patch"
}

build() {
  mkdir -p build  # <---this
  cd build
  cmake "../Yarock_${pkgver}_source" \
    -DCMAKE_BUILD_TYPE=Release \
    -DCMAKE_INSTALL_PREFIX=/usr \
    -DENABLE_QT5=1 \
    -DENABLE_PHONON=ON # <---and this
  make
}

3) I delete all folder /home/user/.config/yarock and leave make all new again

4) i setup in Yarok path to my music and engine (see IMG)