This file contains details of what the second argument for the sigprocmask()
on various systems and compilers is:

  GNU C++			const 2nd argument

  SunOS 4.1.X
 
    CFRONT 2.1/3.0.1            not defined
    Sun 2.1/3.0.1               non const 2nd argument
    CenterLine 2.0              not defined
    ObjectStore 2.0.1           not defined
    Lucid C++ 3.1		const 2nd argument
 
  Solaris 2.X                   const 2nd argument

  SCO UNIX			non const 2nd argument

  NeXTSTEP			const 2nd argument
