I use
ldc2 main.d -L-lcurses
or
dmd main.d -L-lcurses

and following source code:

import std.stdio;

extern(C) int tgetnum(const(char) *id);

int main()
{
    writeln(tgetnum("li"));
    return 0;
}

Note that you don't need to apply toStringz to string literals since they implicitly cast to const char*.

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