libqwt-headers 6.1.2-1ubuntu1 (amd64 binary) in ubuntu wily

 The Qwt library contains Qt GUI Components and utility classes which
 are primarily useful for programs with a technical background. Most of
 these widgets are used to control or display values, arrays, or ranges
 of type double.
 .
 This package contains the header files for both Qt4 and Qt5 versions