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i suspect you're still trying to build on an system which fails or is incomplete on dependencies on either Qt4 or/and Qt5 build dependencies.

i have no big field experience on ubuntu, but you can try following the following basic (theoretical) steps :

1. install all the necessary build dependencies (mandatory are in bold):
   sudo apt-get update
sudo apt-get install qtbase5-dev qtbase5-dev-tools qttools5-dev-tools qtchooser
sudo apt-get install libx11-dev x11proto-core-dev, libqt5x11extras5-dev
sudo apt-get install libjack-dev libasound2-dev libsndfile-dev ladspa-sdk libvorbis-dev libsamplerate-dev
sudo apt-get install libmad0-dev librubberband-dev dssi-dev liblo0-dev zlib1g-dev
sudo apt-get install lv2-dev liblilv-dev libsuil-dev
2. on the source tree, start on a clean slate:
   ./autogen.sh clean
./autogen.sh
3. main build, from source:
   export QT_SELECT=5
./configure
make
4. finally, if so desired, install from source:
   sudo make install

hth.
cheers