I updated my computer today and it seemed to break Skype for me. Every time I would try to load it from the command line I would get the error
skype: error while loading shared libraries: libGL.so.1: wrong ELF class: ELFCLASS64
This problem on 64-bits systems is caused by /usr/lib being earlier in the LD_LIBRARY_PATH than /usr/lib32. Skype tries the 64-bit libraries and complains, without looking any further. This issue is easily solved this way.
1. I created a skype.conf file in the /etc/ld.so.conf.d directory.
# sudo vi /etc/ld.so.conf.d/skype.conf
2. I added the following line to this file