Are you aware of this?

making all mod_event_zmq

make[4]: Entering directory `/builddir/build/BUILD/freeswitch-1.6.16/src/mod/event_handlers/mod_event_zmq'

cd /builddir/build/BUILD/freeswitch-1.6.16/libs && /bin/sh /builddir/build/BUILD/freeswitch-1.6.16/build/getlib.sh http://download.zeromq.org zeromq-2.1.9.tar.gz || cd /builddir/build/BUILD/freeswitch-1.6.16/libs && /bin/sh /builddir/build/BUILD/freeswitch-1.6.16/build/getlib.sh http://download.zeromq.org/historic zeromq-2.1.9.tar.gz

  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current

                                 Dload  Upload   Total   Spent    Left  Speed

  0    95    0    95    0     0     69      0 --:--:--  0:00:01 --:--:--   840

curl: (60) Peer certificate cannot be authenticated with known CA certificates

More details here: http://curl.haxx.se/docs/sslcerts.html

curl performs SSL certificate verification by default, using a "bundle"

 of Certificate Authority (CA) public keys (CA certs). If the default

 bundle file isn't adequate, you can specify an alternate file

 using the --cacert option.

If this HTTPS server uses a certificate signed by a CA represented in

 the bundle, the certificate verification probably failed due to a

 problem with the certificate (it might be expired, or the name might

 not match the domain name in the URL).

If you'd like to turn off curl's verification of the certificate, use

 the -k (or --insecure) option.

cannot find zeromq-2.1.9.tar.gz

  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current

                                 Dload  Upload   Total   Spent    Left  Speed

  0     9    0     9    0     0     39      0 --:--:-- --:--:-- --:--:--    77

gzip: zeromq-2.1.9.tar.gz: not in gzip format

/bin/gtar: This does not look like a tar archive

/bin/gtar: Exiting with failure status due to previous errors