Undefined symbol: _ZN3ERT11smspec_nodeC1ERKSs

Trying to run a few test cases and keep on getting this message:
```
[david@localhost Tests]$ flow OPM-TST-A01.DATA |& tee OPM-TST-A01.LOG
flow: symbol lookup error: /usr/lib64/libopmparser.so.2017: undefined symbol: _ZN3ERT11smspec_nodeC1ERKSs
[david@localhost Tests]$ 
```
Any idea how to fix this?

I'm running on CentOS release 6.9 (Final).
