While trying to compile sage-5.4beta1 on FreeBSD, it failed because of
another place using "#!/bin/bash". As I understand it, it should be
"#!/usr/bin/env bash".
This time it is in fflas_ffpack-1.6.0//src/
fflas-ffpack-config.in
I'll file a ticket (except trac.sage isn't working for me right now).
But this is the second time in about as many days that this error has
been introduced. So I thought that a general message about this would
be good.