Can't build glib outside the source tree

[Trever Fischer]

I can't seem to be able to build packagekit-glib outside of the source tree. 
It fails because of this:

PackageKit/lib/packagekit-glib/pk-client.c:56:40: error: packagekit-glib/pk-
marshal.h: No such file or directory

The file exists in my build directory though (/tmp/build-
PackageKit/lib/packagekit-glib/).
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