[libvirt] libvirt can't get capablities

[Christophe Fergeau]

On Mon, Jul 02, 2012 at 05:56:35PM +0800, Osier Yang wrote:
> I'm wondering if we should force to require yajl-devel if build with
> "with-qemu", as without yajl-devel, it can't do much work with new
> qemu now.

Something like this ? ;)

commit 350583c859deaaddc98d7319e1c2ad649e4d3e83
Author: Eric Blake <eblake at redhat.com>
Date:   Wed Jun 13 10:09:39 2012 -0600

    build: hoist qemu dependence on yajl to configure
    
    Commit 6e769eba made it a runtime error if libvirt was compiled
    without yajl support but targets a new enough qemu.  But enough
    users are hitting this on self-compiled libvirt that it is worth
    erroring out at compilation time, rather than an obscure failure
    when trying to use the built executable.
    
    * configure.ac: If qemu is requested and -version works, require
    yajl when qemu version is new enough.
    * src/qemu/qemu_capabilities.c (qemuCapsComputeCmdFlags): Add
    comment.
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