library not working

i''ve built a STATIC library in VC5 and it works find on my computer. When i tried using that library on somebody else''s computer, doing all the proper things (providing directory, adding library to the link list), it finds the library, but gets unresolved externals for the functions, like they aren''t in the library at all. Then i actually built the library on their computer, using the source code, and it still won''t work! This might have been VC6, i''m not sure now... So, is there something special i have to do to include a library in VC6? Or is something else wrong? thanx in advance