defn of gint32 (glibconfig.h)?

[Skip Montanaro <skip pobox com>]

I was trying to track down the definition of gint32 and the other
size-specific types just now.  I have been building from CVS for quite
awhile and never have any problems related to these types, but I can't seem
to find gint32 defined in the installed header files.  In my glib source
tree I see a typedef for it in glibconfig.h, but that file doesn't get
installed into /usr/local/include/glib-2.0.