Errors between erlang versions

[vmbb]

Using the ppa for CouchDB to get 1.6.1 on Ubuntu 14.04, it pulls in erlang:
release,"OTP APN 181 01","R16B03","5.10.4"

8 out of 9 tests pass; the error is:
==> couchdb-ldap-auth (eunit)
ldap_integration_tests: integration_test_...failed
in function eldap:open/2
called as open(["cosrootdc02.eng.vmware.com"],[{ssl,false}])
in call from ldap_auth_gateway:connect/2 (src/ldap_auth_gateway.erl, line 52)
in call from ldap_integration_tests:'-integration_test_/0-fun-0-'/0 (test/ldap_integration_tests.erl, line 20)
**error:undef

Using a newer version of erlang:
release,"Erlang/OTP","17","6.1"

the tests run great, all 9 pass. This was tested on both OS X and Ubuntu - if I install a newer version of erlang and build couchdb and the ldap auth plugin by hand, then all tests pass.

Any ideas? (I'm an erlang n00b, which probably doesn't help).