It seems that there is a problem compiling the Linux version of Truecrypt v4.2a on the 2.6.18 series of kernels. A patch has been posted in the Truecrypt forums (you need to be logged-in to read), but, although this patch resolves the compilation error, there have been reports that the program has problems unmounting the encrypted volumes and releasing the loop devices. So, truecrypt is a no-go for Fedora 6 at the moment, at least until a new version that works flawlessly is released. An alternative way to create encrypted file containers pretty much like Truecrypt is by using dm-crypt and LUKS. More information about this method, can be found in another article of mine.
TrueCrypt on 2.6.18 kernels by George Notaras is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
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well, it’s mid-January 2007 and this still has not been fixed. I have this kernel on fc5 and tc will not compile.