To install CTF on Fedora, you'll need these additional libraries: libXm.so.3 and
libstdc++.so.5. The libstdc++ library is available via yum.
# yum install compat-libstdc++-33
The libXm library is Open Motif; the CTF installer can install this in /usr/X11R6/lib. If you have Lesstif, that might be in /usr/lib/libXm.so.2, and might confuse things. In fact the installation of the Open Motif .rpm files might fail, but you might not want it to overwrite your Lesstif installation anyway, so it may be best to just plonk libXm.so.3 from the link above into /usr/lib. For more info look at the files in /tmp/mnt/ctf.linux/pub.
This one is required for AFNI, and I believe it may be required for CTF, if in doubt, install it: libXp.so.6.2
# yum install libXp-devel
Put these libraries (you don't need to do this if you used yum) in your /usr/lib/ folder (you'll need root access). Then type the command:
/sbin/ldconfig
Then you can proceed with the installation normally.