gEDA: Help with Output global in PCB. . . .

[sdb-at-NOSPAMcloud9_dot_net (Stuart Brorson)]

Hi --

There is a struct called OutputType in PCB.  It seems to define the
structure for a global variable called Output, which is used all over
the place.  Often, I see this kind of construct in a function:

void foo(bar) {
  OutputType *out
  . . . .
  out = &Output;
  out->window = gtk_widget_new();
  baz(out->fromble);
  . . . .

I have searched through the code to see where Output is created or
defined, but without any luck.  It appears to be a global which is
built by many functions which add pieces to it, like above.  The
problem is, I don't see where Output is originally defined, newed, or
malloced.  

I belive this has something to do with the many warnings I get when
running gpcb (gtkpcb?) on my Fedora 2 & Fedora 3 boxes.  I also see
occasional strange pointers when running gdb on gpcb, as if I am
accessing unmalloced memory.  However, valgrind doesn't complain at
all, so I am mystified.

Any pointers on the definition and use of the variable Output would be
appreciated!

Stuart