Updating glib2.0

[Ken Brown via Cygwin-apps]

I've been planning to adopt gimp and some related build dependencies.  My reason 
is that I use gimp and would like to see it kept up to date.

I thought I had all the prerequisites I needed.  But when I built gimp, I 
discovered that it used two functions, g_set_weak_pointer and 
g_date_time_new_from_iso8601, that were introduced in glib-2.56.

[gimp's configure.ac says that it only requires glib 2.54.2, but this seems to 
be wrong.  Cygwin's glib is at 2.54.3.  Fedora's is at 2.64.3, which is the 
latest upstream release.]

I'd appreciate some advice about how to proceed.  I'm not interested in adopting 
all of GNOME, and it probably doesn't make sense for different components of 
GNOME to be adopted by different people.

A short-term solution (from my personal POV) would be for me to do a 
non-maintainer update of glib to 2.56, assuming that's doable without messing up 
other GNOME components.

A better solution (again from my personal POV) would be for someone to adopt 
GNOME and update it to its latest release.

Ken