[libvirt] seek alternative way of compiling historical version

[Dan]

Hi All,

To compile to a non-current version, I could download a tar ball, or switch
to an older branch in git, then do ./autogen.sh (or ./configure) && make
&& make install.

But for some purpose, I may want to compile to historical version easily
without redundantly downloading the source by using some magic flag
passed into either ./configure, ./autogen.sh, or make, e.g.:

$ ./configure --version=2.0, or
$ ./autogen.sh --version-git=1.0

Is that possible at all?

Related question, normally speaking, how to test back-compatibility
of a new patch, or do we need to test it at all?

P.S., I was just reading v0.0.1 libvirt [1].
It is so nice to see there is, well, was nothing more then 2000 LOC
for C source code.

[1] ftp://libvirt.org/libvirt/old/libvir-0.0.1.tar.gz

Dan
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