If getting error while trying to start SQL Developer on 64 bit Fedora
java.lang.UnsatisfiedLinkError: /usr/java/jdk1.6.0_07/jre/lib/i386/xawt/libmawt.so: libXtst.so.6: cannot open shared object file: No such file or directory
The installed libXtst is 64 bit and sqldeveloper will not work until 32bit version of the same package is installed.
Installing 32 bit package on Fedora
sudo yum install packagename.i686
Now to fix the Oracle SQL Developer problem install the 32 bit version of libXtst
sudo yum install libXtst.i686