Uwe:
Thanks for your advice. I downloaded and installed the qwt-5.2 branch from the SourceForge SVN web site. For those who have been following this, the Subversion command I used to do this is:
svn co https://qwt.svn.sourceforge.net/svnr...anches/qwt-5.2 qwt-5.2
(See the pdf file three messages back for more details about what I did.)
Both the qwt examples and the program I'm developing work with this version of qwt and Qt 4.5.0.
For my application, I simplified my .pro file as you suggested in the preceding message.
One additional step that I had to take was to add the path to the qwt dll file to my Windows environment PATH variable (e.g., c:\qwt-5.2\lib). The "make" process works fine without adding the path, but trying to run the executables (both the qwt examples and my program) would fail with a Windows message that qwt5.dll could not be found. Possibly the need to add this path could be included in the qwt Install file either under Section C1 or C1-C3.
Harry
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