Mingw build and building on MacOSX

Hello,
I built the software and demo programs successfully on Linux using configure. 
Similarly on Mac OSX Snow Leopard using Macports  with  GTK running under X11, 
no modifications were necessary
However on MingW under Win7 using the lastest gcc (4.6.2) and gtk 2.22.1 bundle, 
I was able to compile using configure both the libraries and applications.
testgtkplot starts, but draws only a few lines and no text.  I used no options 
to configure.

compilation with Makefile.mingw also works, but I cannot compile the test 
applications with this Makefile because there are no rules present.
Getting this to work on Mingw is essential if I am to use it for our application.

Any help appreciated,

Charles


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