Thanks for the hint Weiland. The install seemed to go seamlessly, however, I still do not see any QWT widgets in designer. Programmatically, QWT is working fine. I don't know what I am missing.
Here is some output from qtcreator:
$ qtcreator -version
Qt Creator 3.0.1 based on Qt 5.2.1
AnalyzerBase 3.0.1 Code Analyzer Base Plugin
Android 3.0.1 Support for deployment to and execution on Android Devices
AutotoolsProjectManager 3.0.1 Autotools project integration.
BareMetal 3.0.1 This plugin adds a target for bare metal development.
Bazaar 3.0.1 Bazaar integration.
BinEditor 3.0.1 Binary editor component.
Bookmarks 3.0.1 Bookmarks in text editors.
CMakeProjectManager 3.0.1 CMake support
CVS 3.0.1 CVS integration.
ClassView 3.0.1 Class View component.
ClearCase 3.0.1 ClearCase integration.
CodePaster 3.0.1 Codepaster plugin for pushing/fetching diff from server
Core 3.0.1 The core plugin for the Qt IDE.
CppEditor 3.0.1 C/C++ editor component.
CppTools 3.0.1 Tools for analyzing C/C++ code.
Debugger 3.0.1 Debugger integration.
Designer 3.0.1 Qt Designer integration.
DiffEditor 3.0.1 Diff editor component.
FakeVim 3.0.1 VI-style keyboard navigation.
Find 3.0.1 Provides the find widget and the hooks for find implementations.
GLSLEditor 3.0.1 Editor for GLSL.
GenericProjectManager 3.0.1 Generic support
Git 3.0.1 Git integration.
Help 3.0.1 Help system.
ImageViewer 3.0.1 Image Viewer component.
Ios 3.0.1 Support for deployment to and execution on iOS Devices
Locator 3.0.1 Provides the Locator widget and the hooks for Locator filter implementations.
Macros 3.0.1 Macros in text editors.
Mercurial 3.0.1 Mercurial integration.
Perforce 3.0.1 Perforce integration.
ProjectExplorer 3.0.1 ProjectExplorer framework that can be extended with different kind of project types.
PythonEditor 3.0.1 Editor and file creation wizards for Python. Example plugin for QtCreator API demonstration.
QbsProjectManager 3.0.1 QBS support
QmakeProjectManager 3.0.1 Provides project type for Qt/QMake .pro files and tools.
QmlDesigner 3.0.1 Visual Designer for QML files.
QmlJSEditor 3.0.1 Editor for QML and JavaScript.
QmlJSTools 3.0.1 Tools for analyzing Qml/JS code.
QmlProfiler 3.0.1 Qml Profiler Plugin
QmlProjectManager 3.0.1 Qt Quick support
Qnx 3.0.1 Adds support for QNX and BlackBerry 10 to Qt Creator
QtSupport 3.0.1 Provides support code for build systems.
RemoteLinux 3.0.1 Support for deployment to and execution on a remote Linux host.
ResourceEditor 3.0.1 Editor for qrc files.
Subversion 3.0.1 Subversion integration.
TaskList 3.0.1 Use .tasks-files to populate the Issues view.
TextEditor 3.0.1 Text editor framework and the implementation of the basic text editor.
Todo 3.0.1 Adds pane that lists all TODO, FIXME, etc. entries in comments.
Valgrind 3.0.1 Valgrind Plugin
VcsBase 3.0.1 Version Control System Base Plugin
Welcome 3.0.1 Default Welcome Screen Plugin
(C) 2014 Digia Plc
qmake:
$ qmake --version
QMake version 3.0
Using Qt version 5.2.1 in /usr/lib/x86_64-linux-gnu