I would like to use this library under windows

If you have the library on windows, then you can use it with Inline::C in the same way as ig used it on linux. Is there a Windows version of this library available ? The source wouldn't compile for me (on Windows) due to (at least) one missing header file - and I didn't persevere with trying to find a workaround.

can inline::c use just the C files?

You could probably use just the C files with Inline::C - but you'd still need to overcome that problem of the missing header(s), and it's much simpler, imo, to use the library anyway.

Cheers,
Rob