Wow. I'm really impressed! Freenas?

[simoncn]

(01-06-2015 08:19)n3mmr Wrote:  A deeper worry is why it wants /lib/libc.so.7:version GLIBC_2.4.

And what to do about it.

My /lib/libc.so.7 exists.

You should be able to check the version of your libc.so.7 by typing

/lib/libc.so.7

in a terminal window.

From the message you are getting, it looks like the files that airflow has built require GLIBC version 2.4 or greater.