If you run the ANSYS 12.0 installation script (“INSTALL”) but see the following error:

/tmp/ans_install_tmp5134/common/../tcl/wish: error while loading shared libraries: /tmp/ans_install_tmp5134/common/../tcl/libimf.so: cannot restore segment prot after reloc: Permission denied

then check your SELinux settings, which may be preventing the shared library from loading.