QStage porting Stage for Windows MinGW

This is a port of the project Stage 4.1.1 on Windows XP. Using QtCreator as
IDE 2.6.0 utilizing MinGW 4.6.2, FLTK 1.3.1 and MSYS 1.0.11.
I put in attachment the entire project. The problem that arises is in the
file blockgroup.cpp
In particular in the function BlockGroup::BuildDisplayList( ).
There seems to be a problem when running on glu32.dll
[code]gluTessEndPolygon (tobj);[/code]
see
[code]
//GG-d:
printf("\nGG-d (1) BlockGroup::BuildDisplayList()\n");
//GG: fine

gluTessEndPolygon(tobj);

//GG-d:
printf("\nGG-d (2) BlockGroup::BuildDisplayList()\n");
//GG: fine
[/code]
can you help me to solve this problem 
http://old.nabble.com/file/p34887196/QStage.zip QStage.zip ?
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