RM G Numerics (GNAT Reference Manual)

### 6.60 RM G: Numerics ¶

> “If Fortran (respectively, C) is widely supported in the target environment, implementations supporting the Numerics Annex should provide the child package `Interfaces.Fortran` (respectively, `Interfaces.C`) specified in Annex B and should support a `convention_identifier` of Fortran (respectively, C) in the interfacing pragmas (see Annex B), thus allowing Ada programs to interface with programs written in that language.”

Followed.