[Omp] Why there is no default(private) in OpenMP C/C++ standard?

[Chunhua Liao]

Hi,
I am just curious about this difference between C/C++ and Fortran. In the
draft of spec 2.5 page 68, 69.

The syntax of the default clause is as follows:
  C/C++    default(shared | none)
  Fortran  default(private | shared | none)

Any reason for this?