[vtkusers] Compile errors in threads.c

[Gib Bogle]

Hi, I'm trying to build VTK 5.6 using MinGW 4.4.  There are several  
errors when compiling threads.c:

C:\VTK-src\Utilities\vtklibxml2\threads.c: In function  
'vtk_libxml2_xmlRMutexUnl
ock':
C:\VTK-src\Utilities\vtklibxml2\threads.c:399: error: incompatible  
types when as
signing to type 'pthread_t' from type 'int'
C:\VTK-src\Utilities\vtklibxml2\threads.c: In function  
'vtk_libxml2_xmlGetThread
Id':
C:\VTK-src\Utilities\vtklibxml2\threads.c:624: error: aggregate value  
used where
  an integer was expected
C:\VTK-src\Utilities\vtklibxml2\threads.c: In function  
'vtk_libxml2_xmlIsMainThr
ead':
C:\VTK-src\Utilities\vtklibxml2\threads.c:660: error: invalid operands  
to binary
  == (have 'pthread_t' and 'pthread_t')
C:\VTK-src\Utilities\vtklibxml2\threads.c: In function 'xmlOnceInit':
C:\VTK-src\Utilities\vtklibxml2\threads.c:790: error: 'run_once'  
undeclared (fir
st use in this function)
C:\VTK-src\Utilities\vtklibxml2\threads.c:790: error: (Each undeclared  
identifie
r is reported only once
C:\VTK-src\Utilities\vtklibxml2\threads.c:790: error: for each  
function it appea
rs in.)
C:\VTK-src\Utilities\vtklibxml2\threads.c:796: error: incompatible  
types when as
signing to type 'pthread_t' from type 'DWORD'
mingw32-make[2]: ***  
[Utilities/vtklibxml2/CMakeFiles/vtklibxml2.dir/threads.c.o
bj] Error 1
mingw32-make[1]: ***  
[Utilities/vtklibxml2/CMakeFiles/vtklibxml2.dir/all] Error
2
mingw32-make: *** [all] Error 2

Is there a way around this problem?

Thanks
Gib

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