Floating point exception

Hellp, I get a "Floating point exception" when I try to execute this at CentOS 5.11 using the current code. I have compiled libjpeg (v9b) and jp2a myself. Any ideas?

Edit: I get the same error on my Mac with newest El Capitan, everything as vanilla as possible.

Reproduce the failure when executing jp2a on CentOS 5.11 and macOS with self-compiled libjpeg v9b, then inspect the execution path associated with the floating-point exception. Done means identifying a reproducible cause and confirming that jp2a no longer crashes on the reported environments.

Written by the indexing model from the issue text.