In your script, these two lines close to the top should do the trick:
bash allows you to set and export a variable in a single statement, not all shells do, so the two step approach is more portable, if that's a concern.
If this isn't working for you, check that you are running the script from the right place - using
$(pwd) like this ties you to running the script from the directory that contains the required
If you want to be able to run the script from anywhere, you need to use the absolute path to the
./lib subdir, or construct a relative path from the directory portion of the path to the script using, e.g.,