[vtkusers] errors in build vtkWin32VideoSource

[zhangzhijun]

Dear all:
        I want to add the vtkWin32Videosource class, and I first add it in the makefile.in
and run pcmaker, and then run nmake in windows to build it. but it failed and I got 
the following information. can anyone tell me how to do it?

 cl.exe /nologo /D "STRICT" /MD /W3 /Ob1 /Oi /Ot /Oy /Gs /I "C:\Program F
iles\Microsoft Visual Studio\VC98\include" /I "C:\vtkbin" /I "C:\Program Files\v
tk32\vtksrc\common" /I "C:\Program Files\vtk32\vtksrc\graphics" /I "C:\Program F
iles\vtk32\vtksrc\imaging" /D "NDEBUG" /D "WIN32"  /I "C:\Program Files\vtk32\vt
ksrc\patented"  /I "C:\Program Files\vtk32\vtksrc\contrib"  /D "_WINDOWS" /D "_W
INDLL" /D "_MBCS" /D "VTKDLL" /Foobj\ /c "C:\Program Files\vtk32\vtksrc\graphics
\vtkGraphicsFactory.cxx"
vtkGraphicsFactory.cxx
        link.exe @C:\WINDOWS\TEMP\nma36843.
   Creating library vtkdll.lib and object vtkdll.exp
vtkWin32VideoSource.obj : error LNK2001: unresolved external symbol _capCreateCa
ptureWindowA at 32
vtkdll.dll : fatal error LNK1120: 1 unresolved externals
NMAKE : fatal error U1077: 'C:\vtkbin\vtkdll\link.exe' : return code '0x460'
Stop.

regards,
zj zhang
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