[libvirt] a compilation issue

[Alex Jia]

Hi developers,
I met the following compilation issue when I 'git checkout v0.9.8-rc1' tag 
then run './configure && make':
<snip>
Copying file ._bootmp/gnulib/lib/netinet_in.in.h
Copying file ._bootmp/gnulib/lib/nonblocking.c
Copying file ._bootmp/gnulib/lib/nonblocking.h
Copying file ._bootmp/gnulib/lib/open.c
.gnulib/gnulib-tool: line 1475: patch: command not found
.gnulib/gnulib-tool: *** patch file gnulib/local/lib/openpty.c.diff didn't apply cleanly
.gnulib/gnulib-tool: *** Stop.
Failed to bootstrap, please investigate.
make: *** [_autogen] Error 1
</snip>

Has any advice about this?

BTW, it's fine when I compiled latest GIT head.

Thanks,
Alex

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