[Libguestfs] how do i use a blob appliance the compiling from source

[Piavlo]

 Hi,

Since I've never succeeded to compile libguestfs from source on
Gentoosince the build process of the appliance based on debootstrap fails,
I'm wondering how can I tell the compilation process to use a
precompiled blob appliance?
Also can I use non fedora & debian but use some minimal gentoo based
appliance I have?

 Thanks
 Alex