New in 2.0:

* Modernized infrastructure.
* Added support for catching stack overflow on AIX 4, HP-UX, and BeOS.
* Dropped support for NeXTstep.
* The function sigsegv_leave_handler() no longer restores the signal mask.
  This must now be done by the calling handler (either through sigprocmask
  or through siglongjmp).

New in 1.2:

* Support for HP-UX contributed by Paolo Bonzini.

New in 1.1:

* Catching stack overflow now works on some Unix systems:
  - Linux 2.2.x with glibc-2.1,
  - Sun Solaris,
  - DEC OSF/1 4.0,
  - SGI Irix.

