Undefined reference to g_file_load_bytes()

[PC Buddies <grahamkelvador gmail com>]

 During my application programming, I had to use the GIO function
g_file_load_bytes().

I have my GTK+ installation installed from MSYS (the new method)
so I obviously have GIO. I previously even used g_file_load_contents()
without problems, but now, it weirdly doesn't find definition for
`g_file_load_bytes()` in the libraries..

I checked the headers and not surprisingly I could not find declarations
for this function either. I have had similar problem with other glib
functions before too, most of the functions from the man page work, but
some not.

What should I do?