RooFit depends from MathMore when ROOT compiled with -Dmathmore=ON

In the file RooMathCoreReg.cxx, following includes are used:

#include "Math/SpecFunc.h"
#include "Math/DistFunc.h"

They checking internally R__HAS_MATHMORE and including MathMore includes then.

Dependency is not configured now and will be introduced by PR:

https://github.com/root-project/root/pull/5439

One should modify roofit classes to move all MathMore-related code to roofitmore and then remove dependency