where should I put qwt plugin on linux?

[Uwe]

In opposite to David I recommend not to copy the plugin: instead configure your environment to load the plugin from where it is installed by "make install".

A) This step has to be done for both ways:

Open a shell and enter the following command ( of course you have to replace the path by where you have installed the plugin ):

ldd  /usr/local/qwt-6.1.0-svn/plugins/designer/libqwt_designer_plugin.so

ldd  /usr/local/qwt-6.1.0-svn/plugins/designer/libqwt_designer_plugin.so

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On my box it results to something like this:

linux-gate.so.1 =>  (0xffffe000)
	libqwt.so.6 => /home1/uwe/qwt/qwt/lib/libqwt.so.6 (0xb7586000)
	libQtXml.so.4 => /usr/local/Trolltech/Qt-4.8.0-debug/lib/libQtXml.so.4 (0xb7537000)
	libQtGui.so.4 => /usr/local/Trolltech/Qt-4.8.0-debug/lib/libQtGui.so.4 (0xb68b3000)
	libQtCore.so.4 => /usr/local/Trolltech/Qt-4.8.0-debug/lib/libQtCore.so.4 (0xb656a000)
	libQtDesigner.so.4 => /usr/local/Trolltech/Qt-4.8.0-debug/lib/libQtDesigner.so.4 (0xb5fbd000)
        ...

linux-gate.so.1 =>  (0xffffe000)
	libqwt.so.6 => /home1/uwe/qwt/qwt/lib/libqwt.so.6 (0xb7586000)
	libQtXml.so.4 => /usr/local/Trolltech/Qt-4.8.0-debug/lib/libQtXml.so.4 (0xb7537000)
	libQtGui.so.4 => /usr/local/Trolltech/Qt-4.8.0-debug/lib/libQtGui.so.4 (0xb68b3000)
	libQtCore.so.4 => /usr/local/Trolltech/Qt-4.8.0-debug/lib/libQtCore.so.4 (0xb656a000)
	libQtDesigner.so.4 => /usr/local/Trolltech/Qt-4.8.0-debug/lib/libQtDesigner.so.4 (0xb5fbd000)
        ...

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When you see something like this:

linux-gate.so.1 =>  (0xffffe000)
	libqwt.so.6 => not found
        ...

linux-gate.so.1 =>  (0xffffe000)
	libqwt.so.6 => not found
        ...

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... you have to read about ldconfig and LD_LIBRARY_PATH.

B) Read about QT_PLUGIN_PATH: see http://doc.qt.nokia.com/4.7/deployment-plugins.html

Of course all environment variables need to be set in the environment, where you start the creator - f.e start the creator from the same shell, where you have set them.

HTH,
Uwe