[Libguestfs] [PATCH v2] Add error callback (RHBZ#602599).

Slightly updated version of this patch. Firstly this updates the linker script so you can actually use this new call. Secondly it adds a test. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones New in Fedora 11: Fedora Windows cross-compiler. Compile Windows programs, test, and build Windows installers. Over 70 libraries supprt'd http://fedoraproject.org/wiki/MinGW http://www.annexia.org/fedora_mingw