The lib in src/phaseSystemModels/reactingEulerFoam/phaseSystems/
was not fully linked due to cyclic dependencies. When used in 'fieldFunctionObject' (to get the HTC for multiphase), created a problem of linking in two apps:
applications/utilities/preProcessing/createExternalCoupledPatchGeometry/Make/options applications/solvers/multiphase/reactingEulerFoam/functionObjects/Make/options
And surely when called from controlDict in the tutorials.
Previously the missing libs were provided in the solvers (Euler solvers).
As we need a fully linked phaseSystems lib. I compiled last this lib in rc/phaseSystemModels/reactingEulerFoam/Allwmake. This creates a complete lib usable in fieldFunctionObject.
Some changes were needed in the intermediate libs as well for compilation.