Definition of SIGRTMIN

[Andre via Digitalmars-d-learn]

Hi,

I cannot use the definition of SIGRTMIN on ubuntu.
For following code I receive errors:
import core.sys.posix.time, core.sys.posix.signal, 
core.sys.posix.stdlib, core.sys.posix.unistd;
import std.stdio;

alias SIG = SIGRTMIN;

void main()
{
  writeln("Establishing handler for signal %d\n", SIG);
}


source/app.d(77): Error: function 
core.sys.posix.signal.__libc_current_sigrtmin is not accessible 
from module app


Is there s.th. wrong with the definition?

Kind regards
André