The default value of atk-bridge-location key in org.a11y.atspi.gschema.xml is invalid.
Or, the type of the key is invalid.
Although the type is "ay" (byte array), the default value is a string.

    <key name="atk-bridge-location" type="ay">
      <default>'@libdir@/gtk-3.0/modules/libatk-bridge.so'</default>
      <summary>Atk-bridge location</summary>
      <description>The path to the atk-bridge module; useful for non-GTK applications/toolkits that want to load it.</description>
    </key>

This problem is relevant to Bug 645321.


The following is a part of messages of compile error:
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make[2]: Entering directory `/home/jiro/work/dev/gnome/source/at-spi2-atk/schemas'
sed -e "s|@libdir[@]|/home/jiro/work/dev/gnome/install/lib64|" org.a11y.atspi.gschema.xml.in > org.a11y.atspi.gschema.xml
if test -f "org.a11y.atspi.gschema.xml"; then d=; else d="./"; fi; /home/jiro/work/dev/gnome/install/bin/glib-compile-schemas --strict --dry-run  --schema-file=${d}org.a11y.atspi.gschema.xml && touch org.a11y.atspi.gschema.valid
org.a11y.atspi.gschema.xml: Error on line 6 char 1: 0-74:can not parse as value of type `ay'.  --strict was specified; exiting.
make[2]: *** [org.a11y.atspi.gschema.valid] Error 1
make[2]: Leaving directory `/home/jiro/work/dev/gnome/source/at-spi2-atk/schemas'
---


The following is contents of org.a11y.atspi.gschema.xml on my build-environment:
----
<?xml version="1.0"?>
<schemalist>
  <schema id="org.a11y.atspi" path="/a11y/atspi/">
    <key name="atk-bridge-location" type="ay">
      <default>'/home/jiro/work/dev/gnome/install/lib64/gtk-3.0/modules/libatk-bridge.so'</default>
      <summary>Atk-bridge location</summary>
      <description>The path to the atk-bridge module; useful for non-GTK applications/toolkits that want to load it.</description>
    </key>
  </schema>
</schemalist>
----