how to resolve "error lnk 2001"

From: yanwan (yanwan.yan_at_postgrad.manchester.ac.uk)
Date: 12/08/04 

Date: Wed, 8 Dec 2004 14:21:36 -0000

I met this problem in executing a c++ project in visual studio.
Does anyone have suggestions to resolve "error lnk 2001"?

--------------------Configuration: reconstruction - Win32
Debug--------------------
Linking...
icarus_camera.obj : error LNK2001: unresolved external symbol _dgels_
icarus_leastsquares.obj : error LNK2001: unresolved external symbol _dgels_
icarus_maths.obj : error LNK2001: unresolved external symbol _dgels_
icarus_dialog.obj : error LNK2001: unresolved external symbol _sdQueryCache
icarus_form.obj : error LNK2001: unresolved external symbol _sdQueryCache
icarus_dialog.obj : error LNK2001: unresolved external symbol _sdInitCache
icarus_form.obj : error LNK2001: unresolved external symbol _sdInitCache
icarus_dialog.obj : error LNK2001: unresolved external symbol _sdClearCache
icarus_form.obj : error LNK2001: unresolved external symbol _sdClearCache
icarus_form.obj : error LNK2001: unresolved external symbol _sdReadFrameData
icarus_iformat.obj : error LNK2001: unresolved external symbol "bool __cdecl
getImageData(char *,unsigned char *)" (?getImageData@@YA_NPADPAE@Z)
icarus_iformat.obj : error LNK2001: unresolved external symbol "bool __cdecl
getImageSize(char *,unsigned int *,unsigned int *)"
(?getImageSize@@YA_NPADPAI1@Z)
icarus_iformat.obj : error LNK2001: unresolved external symbol "bool __cdecl
writeFidoFile(char *,int,int,unsigned char *)"
(?writeFidoFile@@YA_NPADHHPAE@Z)
icarus_iformat.obj : error LNK2001: unresolved external symbol "bool __cdecl
writeDPXFile(char *,int,int,unsigned char *)"
(?writeDPXFile@@YA_NPADHHPAE@Z)
icarus_image.obj : error LNK2001: unresolved external symbol _ex_parseFile
icarus_image.obj : error LNK2001: unresolved external symbol _sdCloseMovie
icarus_main.obj : error LNK2001: unresolved external symbol _sdCloseMovie
icarus_image.obj : error LNK2001: unresolved external symbol
_sdOpenMovieRead
icarus_image.obj : error LNK2001: unresolved external symbol
_sdWriteFrameData
icarus_image.obj : error LNK2001: unresolved external symbol
_sdOpenMovieWrite
icarus_leastsquares.obj : error LNK2001: unresolved external symbol _dgesvd_
icarus_maths.obj : error LNK2001: unresolved external symbol _dgesvd_
icarus_maths.obj : error LNK2001: unresolved external symbol _dscal_
icarus_maths.obj : error LNK2001: unresolved external symbol _dnrm2_
icarus_maths.obj : error LNK2001: unresolved external symbol _dgetri_
icarus_maths.obj : error LNK2001: unresolved external symbol _dgetrf_
icarus_optimizer.obj : error LNK2001: unresolved external symbol _subplx_
icarus_primitive.obj : error LNK2001: unresolved external symbol _dsyevd_
Debug/reconstruction.exe : fatal error LNK1120: 21 unresolved externals
Error executing link.exe.

reconstruction.exe - 29 error(s), 0 warning(s)

Thank you!

yanwan

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