Of course, Ulrich did know. The
System V ABI specification’s ELF section contains the requirement
that $LD_LIBRARY_PATH have those semantics
a string that holds a list of directories, separated by colons (:). For example, the string /home/dir/lib:/home/dir2/lib: tells the dynamic linker to search first the directory /home/dir/lib, then /home/dir2/lib, and then the current directory to find dependencies.
Moral of the story. Don’t do
Do this instead
if [ -n $LD_LIBRARY_PATH ]; then export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/some/other/dir else export LD_LIBRARY_PATH=/some/other/dir fi