-- Python checking for PyQt5 - found
-- Checking for module 'Qt5Qwt6'
--   No package 'Qt5Qwt6' found
-- QWT Version: 6.1.3
-- Could NOT find Qwt (missing: QWT_LIBRARIES)

apt-cache search qwt
libqwt-dev - Qt widgets library for technical applications (development, qt4)
libqwt-doc - Qt widgets library for technical applications (documentation)
libqwt-headers - Qt widgets library for technical applications (header files)
libqwt-qt5-6 - Qt widgets library for technical applications (runtime, qt5)
libqwt-qt5-dev - Qt widgets library for technical applications (development, qt5)
libqwt5-doc - Qt widgets library for technical applications (documentation)
libqwt5-qt4 - Qt4 widgets library for technical applications (runtime)
libqwt5-qt4-dev - Qt4 widgets library for technical applications (development)
libqwt6abi1 - Qt widgets library for technical applications (runtime, qt4)
libqwtmathml-dev - Text Engine for Qwt (development, qt4)
libqwtmathml-qt5-6 - Text Engine for Qwt (runtime, qt5)
libqwtmathml-qt5-dev - Text Engine for Qwt (development, qt5)
libqwtmathml6abi1 - Text Engine for Qwt (runtime, qt4)
libqwtplot3d-doc - 3D plotting library based on Qt/OpenGL (documentation)
libqwtplot3d-qt5-0 - 3D plotting library based on Qt5/OpenGL (runtime)
libqwtplot3d-qt5-dev - 3D plotting library based on Qt5/OpenGL (development)
python-guiqwt - efficient 2D data-plotting library - Python 2
python-guiqwt-doc - efficient 2D data-plotting library - Documentation
python-qwt - Pure Python implementation of Qwt - Python 2
python-qwt5-doc - Python Qwt5 technical widget library, documentation and examples
python-qwt5-qt4 - Python version of the Qwt5 technical widget library
python3-guiqwt - efficient 2D data-plotting library - Python 3
python3-qwt - Pure Python implementation of Qwt - Python 3
python-qwt-doc - Pure Python implementation of Qwt - Documentation