OK, I’ve seen that one before.
Here’s the deal: makepanda builds the library ‘libpystub.so’, then makepanda builds the executable ‘interrogate’ which uses ‘libpystub.so’, then makepanda tries to run interrogate. In order for it to be able to run ‘interrogate’, the directory containing ‘libpystub.so’ needs to be in your shared-library path. Now, supposedly, makepanda contains the necessary code to put the built/lib directory into your LD_LIBRARY_PATH. But apparently, that code isn’t working. Somebody reported this problem before, but then the problem spontaneously went away, so we couldn’t diagnose it. Could you analyze?