[Geotiff] Help using libgeotiff

[Luthfi]

Hi all geotiff member

I'm new using libgeotiff.
I have difficulty when implement the library in VC++.
I have add all *.h, *.c, *.cpp, *.inc in my include directory
when I build the project, there come an error in linking process

Linking...
readGeoTiffDlg.obj : error LNK2001: unresolved external symbol _GTIFNew
readGeoTiffDlg.obj : error LNK2001: unresolved external symbol _XTIFFOpen
Debug/readGeoTiff.exe : fatal error LNK1120: 2 unresolved externals
Error executing link.exe.

Anybody have suggestion about this? 
Thank you

Best Regards,
Luthfi
Indonesia