To install QTAU and its dependencies on Manjaro run the following commands:

#first install global dependencies

sudo pacman -S git gcc make cmake pkg-config autoconf automake libtool

#create a source directory where you clone the repositories:
mkdir ~/src
cd ~/src

#install all dependencies

sudo pacman -S pkg-config libsndfile boost gsl libsmf qjackctl

git clone https://github.com/espeak-ng/espeak-ng
pushd espeak-ng
./autogen.sh
./configure
make
sudo make install
popd

sudo pacman -S libsndfile boost-libs boost gsl
git clone https://notabug.org/isengaara/sekai
pushd sekai
mkdir build
pushd build
cmake ..
make
sudo make install
popd
popd

git clone https://github.com/r9y9/hts_engine_API
pushd hts_engine_API/src
./waf configure
./waf
sudo ./waf install
popd
 
git clone https://notabug.org/isengaara/sinsy
pushd sinsy
mkdir build
pushd build
cmake ..
make
sudo make install
popd
popd

#install QTAU

git clone https://notabug.org/isengaara/qtau
pushd qtau
mkdir build
pushd build
qmake
make
make install
popd
popd