Hi I have just tried to install IDL7.1 on my Linux operational system( red hat enterprise), However I Have some troubles in running it after I Have installed it. the error is as follows: [root@glory bruce]# idl /usr/local/itt/idl71/bin/bin.linux.x86_64/idl: error while loading shared libraries: libXp.so.6: wrong ELF class: ELFCLASS32 Maybe there is something wrong with libXp.so.6. But i have just installed libXp.so.6. and IDL can not work either. However, I can use idlde instead.  I also have installed Java as well. Can you do me a favor to fix this problem? Thank you Bruce