Description of Problem: example files from blt package have following header: #!../src/bltwish Since they are placed in /usr/lib/blt2.4/demos, this path is bad and attempt to execute an example produses "no such file or directory" output. If you replace #!../src/bltwish with #!/usr/bin/bltwish, example works.
This defect is considered SHOULD-FIX for Fairfax.
Fixed in rawhide (blt-2.4u-7). Read ya, Phil