Ada Reference Manual (Ada 2022)
A.17.1 The Packages Wide_Environment_Variables and Wide_Wide_Environment_Variables
The packages Wide_Environment_Variables and Wide_Wide_Environment_Variables allow a program to read or modify environment variables.
Static Semantics
The specification of package Wide_Environment_Variables is the same as for Environment_Variables, except that each occurrence of String is replaced by Wide_String.
The specification of package Wide_Wide_Environment_Variables is the same as for Environment_Variables, except that each occurrence of String is replaced by Wide_Wide_String.