In the IDL 8.0 help table of contents you will see a System Requirements topic where there is a table listing the supported Linux kernal and glibc versions. The following footnote about RedHat Linux is also posted:
e The Linux version of IDL is built on RedHat 4. If your version of Linux is compatible with the listed kernel and glibc versions, you should be able to install and run IDL.
Bill
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