Linker error on static linking to third party lib

Hi all!

Been a while since I've posted, but this little problem has got me stumped. I've got a .lib that is supplied to me by a third party, and I'm having trouble statically linking to it. I'm using MSVC-2008 with QT. The link error is:

Code:

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fatal error C1047: The object or library file 'ThirdPartyLibrary.lib' was created with an older compiler than other objects; rebuild old objects and libraries
1>LINK : fatal error LNK1257: code generation failed

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I don't have the source for this library, only the /lib and /include. Anybody know what it is I'm doing wrong, and what I can fix to link to this thing?

Thanks!

It sounds like the library format may have changed since that library was compiled, causing linker errors.
If you don't have the source, you're pretty much done.