I'm struggling with the same issue and I know I'm on OS 7.

Should I try to install freetds separately?

Red Hat Enterprise Linux Server release 7.3 (Maipo)

Installed: epel-release.noarch 0:7-9

Error: Package: freetds-0.91-2.el6.x86_64 (epel) Requires: libgnutls.so.26(GNUTLS_1_4)(64bit)

/usr/lib64/.libgnutls.so.28.41.16.hmac /usr/lib64/.libgnutls.so.28.hmac /usr/lib64/libgnutls.so.28 /usr/lib64/libgnutls.so.28.41.16

I'm struggling with the same issue and I know I'm on OS 7.

Should I try to install freetds separately?

Red Hat Enterprise Linux Server release 7.3 (Maipo)

Installed:
  epel-release.noarch 0:7-9

Error: Package: freetds-0.91-2.el6.x86_64 (epel)
           Requires: libgnutls.so.26(GNUTLS_1_4)(64bit)

/usr/lib64/.libgnutls.so.28.41.16.hmac
/usr/lib64/.libgnutls.so.28.hmac
/usr/lib64/libgnutls.so.28
/usr/lib64/libgnutls.so.28.41.16