error: no candidate function template was found for dependent friend function template specialization

The build fails on FreeBSD: http://beefy11.nyi.freebsd.org/data/head-i386-default/p487722_s342182/logs/esys-particle-2.3.5_2.log

In file included from /wrkdirs/usr/ports/science/esys-particle/work/ESyS-Particle-2.3.5/Model/EWallInteractionGroup.h:19:
/wrkdirs/usr/ports/science/esys-particle/work/ESyS-Particle-2.3.5/Model/ElasticInteractionGroup.h:55:19: error: no candidate function template was found for dependent friend function template specialization
  friend ostream& operator<< <>(ostream&,const CElasticInteractionGroup<T>&);
                  ^
/wrkdirs/usr/ports/science/esys-particle/work/ESyS-Particle-2.3.5/Foundation/vec3.hpp:305:27: note: candidate ignored: not a function template
VEC3_INLINE std::ostream& operator << (std::ostream& ostr,const Vec3& V)
                          ^
/wrkdirs/usr/ports/science/esys-particle/work/ESyS-Particle-2.3.5/Model/ElasticInteraction.h:80:19: note: candidate ignored: not a function template
  friend ostream& operator<<(ostream&,const CElasticInteraction&);
                  ^