IDL 6.4.1 update for Mac OS X 10.5
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On October 26th, 2007 Apple released Mac OS X version 10.5 (Leopard).
As a result of changes made by Apple, existing IDL 6.4 installations
may not work correctly under the new version.

If you install Mac OS X 10.5 on your computer, you will need to
install the IDL 6.4.1 update in order for IDL 6.4 to work correctly.
This update replaces the libidl.6.4.dylib files in IDL's
bin/bin.darwin.ppc and bin/bin.darwin.i386 directories with versions
of the library modified to operate with Mac OS X 10.5. In addition,
it updates the resource/X11/lib/app-defaults/Idl file to cause the
IDL Development Environment (idlde) to run as a foreground process
rather than a background process.

To install the IDL 6.4.1 update:

1) Ensure that you are logged in to an account that has write
   permissions in the IDL 6.4 installation directory.

2) Download the idl641_mac_osx10_5.tar.gz file attached to this
   Tech Tip and place it in the directory that contains the
   IDL 6.4 installation directory. (If IDL is installed in the
   default location, this is the /Applications/itt directory.)

3) Ensure that IDL is not running.

4) Launch X11 from /Applications/Utilities.

5) In the X11 terminal window, change directories to the directory
   that contains the IDL 6.4 installation directory. (If IDL is
   installed in the default location, this is the /Applications/itt 
   directory.)

   $ cd /Applications/itt/

6) Execute the following commands at the shell prompt:

   $ gunzip idl641_mac_osx10_5.tar.gz
   $ tar -xvf idl641_mac_osx10_5.tar

After you have installed the IDL 6.4.1 update, IDL's
!VERSION.RELEASE system variable field will contain the
value "6.4.1".