cd-profile.c: In function 'cd_profile_set_fd':
cd-profile.c:1069:2: warning: implicit declaration of function 'g_mapped_file_new_from_fd' [-Wimplicit-function-declaration]
cd-profile.c:1069:20: warning: assignment makes pointer from integer without a cast [enabled by default]
  CC     colord-cd-main.o
  CC     colord-cd-sensor-client.o
  CC     colord-cd-udev-client.o
  CCLD   colord
colord-cd-profile.o: In function `cd_profile_set_fd':
cd-profile.c:(.text+0x16d5): undefined reference to `g_mapped_file_new_from_fd'
collect2: ld returned 1 exit status

(In reply to comment #0)
> http://gitorious.org/colord/master/commit/1094fb00ea300122fbb2182be543e6b6790d28d4
> 
> introduced g_mapped_file_new_from_fd. This is available in glib 2.31.x and
> configure.ac wasn't bumped.

Ohh, uncool. In the gtk-doc markup it said that it was available in 2.30, fixed:

commit eece6cb9c33dbbc30e6a71e09f699fe1ab6fdff3
Author: Richard Hughes <richard@hughsie.com>
Date:   Thu Feb 23 10:34:46 2012 +0000

    Fix up 'Since:' for g_mapped_file_new_from_fd()
    
    It was introduced in 2.31.0, not 2.30.x

I'll now add the #ifdefs to avoid adding the configure.ac bump.

commit 638a98fef16fa15946522d4112660b4b20c0d630
Author: Richard Hughes <richard@hughsie.com>
Date:   Thu Feb 23 10:43:37 2012 +0000

    trivial: Fix compile with older versions of GLib
    
    g_mapped_file_new_from_fd() was introduced in 2.31.0 not 2.30.0 as the
    docs suggested.
    
    Resoves https://bugs.freedesktop.org/show_bug.cgi?id=46481