[Libguestfs] where to create localenv?

[lampahome]

I don't want prefix 'git' and I watched this
http://libguestfs.org/guestfs-building.1.html#local-files

. localenv
 ./autogen.sh \
     -C \
     --enable-werror \
     "$@"

but I cannot execute . localenv
and I saw
Note that *localenv* is included by the top Makefile (so it’s a Makefile
fragment). But if it is also sourced by your *localconfigure* script then
it is used as a shell script.

But I don't see any file named localenv after execute cmds and make:

> ./autogen.sh
> make


how to solve it?
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